fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <linux/file.h>
  37 #include <linux/slab.h>
  38 #include <linux/namei.h>
  39 #include <linux/statfs.h>
  40 #include <linux/utsname.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/sunrpc/svcauth_gss.h>
  43 #include <linux/sunrpc/addr.h>
  44 #include <linux/xattr.h>
  45 #include <linux/vmalloc.h>
  46
  47 #include <uapi/linux/xattr.h>
  48
  49 #include "idmap.h"
  50 #include "acl.h"
  51 #include "xdr4.h"
  52 #include "vfs.h"
  53 #include "state.h"
  54 #include "cache.h"
  55 #include "netns.h"
  56 #include "pnfs.h"
  57 #include "filecache.h"
  58
  59 #include "trace.h"
  60
  61 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  62 #include <linux/security.h>
  63 #endif
  64
  65
  66 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  67
  68 const u32 nfsd_suppattrs[3][3] = {
  69         {NFSD4_SUPPORTED_ATTRS_WORD0,
  70          NFSD4_SUPPORTED_ATTRS_WORD1,
  71          NFSD4_SUPPORTED_ATTRS_WORD2},
  72
  73         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  74          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  75          NFSD4_1_SUPPORTED_ATTRS_WORD2},
  76
  77         {NFSD4_1_SUPPORTED_ATTRS_WORD0,
  78          NFSD4_1_SUPPORTED_ATTRS_WORD1,
  79          NFSD4_2_SUPPORTED_ATTRS_WORD2},
  80 };
  81
  82 /*
  83  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  84  * directory in order to indicate to the client that a filesystem boundary is present
  85  * We use a fixed fsid for a referral
  86  */
  87 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  88 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  89
  90 static __be32
  91 check_filename(char *str, int len)
  92 {
  93         int i;
  94
  95         if (len == 0)
  96                 return nfserr_inval;
  97         if (len > NFS4_MAXNAMLEN)
  98                 return nfserr_nametoolong;
  99         if (isdotent(str, len))
 100                 return nfserr_badname;
 101         for (i = 0; i < len; i++)
 102                 if (str[i] == '/')
 103                         return nfserr_badname;
 104         return 0;
 105 }
 106
 107 static int zero_clientid(clientid_t *clid)
 108 {
 109         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 110 }
 111
 112 /**
 113  * svcxdr_tmpalloc - allocate memory to be freed after compound processing
 114  * @argp: NFSv4 compound argument structure
 115  * @len: length of buffer to allocate
 116  *
 117  * Allocates a buffer of size @len to be freed when processing the compound
 118  * operation described in @argp finishes.
 119  */
 120 static void *
 121 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
 122 {
 123         struct svcxdr_tmpbuf *tb;
 124
 125         tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
 126         if (!tb)
 127                 return NULL;
 128         tb->next = argp->to_free;
 129         argp->to_free = tb;
 130         return tb->buf;
 131 }
 132
 133 /*
 134  * For xdr strings that need to be passed to other kernel api's
 135  * as null-terminated strings.
 136  *
 137  * Note null-terminating in place usually isn't safe since the
 138  * buffer might end on a page boundary.
 139  */
 140 static char *
 141 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
 142 {
 143         char *p = svcxdr_tmpalloc(argp, len + 1);
 144
 145         if (!p)
 146                 return NULL;
 147         memcpy(p, buf, len);
 148         p[len] = '\0';
 149         return p;
 150 }
 151
 152 static void *
 153 svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 len)
 154 {
 155         __be32 *tmp;
 156
 157         /*
 158          * The location of the decoded data item is stable,
 159          * so @p is OK to use. This is the common case.
 160          */
 161         if (p != argp->xdr->scratch.iov_base)
 162                 return p;
 163
 164         tmp = svcxdr_tmpalloc(argp, len);
 165         if (!tmp)
 166                 return NULL;
 167         memcpy(tmp, p, len);
 168         return tmp;
 169 }
 170
 171 /*
 172  * NFSv4 basic data type decoders
 173  */
 174
 175 /*
 176  * This helper handles variable-length opaques which belong to protocol
 177  * elements that this implementation does not support.
 178  */
 179 static __be32
 180 nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
 181 {
 182         u32 len;
 183
 184         if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
 185                 return nfserr_bad_xdr;
 186         if (maxlen && len > maxlen)
 187                 return nfserr_bad_xdr;
 188         if (!xdr_inline_decode(argp->xdr, len))
 189                 return nfserr_bad_xdr;
 190
 191         return nfs_ok;
 192 }
 193
 194 static __be32
 195 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 196 {
 197         __be32 *p;
 198         u32 len;
 199
 200         if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
 201                 return nfserr_bad_xdr;
 202         if (len == 0 || len > NFS4_OPAQUE_LIMIT)
 203                 return nfserr_bad_xdr;
 204         p = xdr_inline_decode(argp->xdr, len);
 205         if (!p)
 206                 return nfserr_bad_xdr;
 207         o->data = svcxdr_savemem(argp, p, len);
 208         if (!o->data)
 209                 return nfserr_jukebox;
 210         o->len = len;
 211
 212         return nfs_ok;
 213 }
 214
 215 static __be32
 216 nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
 217 {
 218         __be32 *p, status;
 219
 220         if (xdr_stream_decode_u32(argp->xdr, lenp) < 0)
 221                 return nfserr_bad_xdr;
 222         p = xdr_inline_decode(argp->xdr, *lenp);
 223         if (!p)
 224                 return nfserr_bad_xdr;
 225         status = check_filename((char *)p, *lenp);
 226         if (status)
 227                 return status;
 228         *namp = svcxdr_savemem(argp, p, *lenp);
 229         if (!*namp)
 230                 return nfserr_jukebox;
 231
 232         return nfs_ok;
 233 }
 234
 235 static __be32
 236 nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
 237 {
 238         __be32 *p;
 239
 240         p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3);
 241         if (!p)
 242                 return nfserr_bad_xdr;
 243         p = xdr_decode_hyper(p, &tv->tv_sec);
 244         tv->tv_nsec = be32_to_cpup(p++);
 245         if (tv->tv_nsec >= (u32)1000000000)
 246                 return nfserr_inval;
 247         return nfs_ok;
 248 }
 249
 250 static __be32
 251 nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf)
 252 {
 253         __be32 *p;
 254
 255         p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE);
 256         if (!p)
 257                 return nfserr_bad_xdr;
 258         memcpy(verf->data, p, sizeof(verf->data));
 259         return nfs_ok;
 260 }
 261
 262 /**
 263  * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4
 264  * @argp: NFSv4 compound argument structure
 265  * @bmval: pointer to an array of u32's to decode into
 266  * @bmlen: size of the @bmval array
 267  *
 268  * The server needs to return nfs_ok rather than nfserr_bad_xdr when
 269  * encountering bitmaps containing bits it does not recognize. This
 270  * includes bits in bitmap words past WORDn, where WORDn is the last
 271  * bitmap WORD the implementation currently supports. Thus we are
 272  * careful here to simply ignore bits in bitmap words that this
 273  * implementation has yet to support explicitly.
 274  *
 275  * Return values:
 276  *   %nfs_ok: @bmval populated successfully
 277  *   %nfserr_bad_xdr: the encoded bitmap was invalid
 278  */
 279 static __be32
 280 nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen)
 281 {
 282         ssize_t status;
 283
 284         status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen);
 285         return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok;
 286 }
 287
 288 static __be32
 289 nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace)
 290 {
 291         __be32 *p, status;
 292         u32 length;
 293
 294         if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0)
 295                 return nfserr_bad_xdr;
 296         if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0)
 297                 return nfserr_bad_xdr;
 298         if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0)
 299                 return nfserr_bad_xdr;
 300
 301         if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
 302                 return nfserr_bad_xdr;
 303         p = xdr_inline_decode(argp->xdr, length);
 304         if (!p)
 305                 return nfserr_bad_xdr;
 306         ace->whotype = nfs4_acl_get_whotype((char *)p, length);
 307         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 308                 status = nfs_ok;
 309         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 310                 status = nfsd_map_name_to_gid(argp->rqstp,
 311                                 (char *)p, length, &ace->who_gid);
 312         else
 313                 status = nfsd_map_name_to_uid(argp->rqstp,
 314                                 (char *)p, length, &ace->who_uid);
 315
 316         return status;
 317 }
 318
 319 /* A counted array of nfsace4's */
 320 static noinline __be32
 321 nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
 322 {
 323         struct nfs4_ace *ace;
 324         __be32 status;
 325         u32 count;
 326
 327         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
 328                 return nfserr_bad_xdr;
 329
 330         if (count > xdr_stream_remaining(argp->xdr) / 20)
 331                 /*
 332                  * Even with 4-byte names there wouldn't be
 333                  * space for that many aces; something fishy is
 334                  * going on:
 335                  */
 336                 return nfserr_fbig;
 337
 338         *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count));
 339         if (*acl == NULL)
 340                 return nfserr_jukebox;
 341
 342         (*acl)->naces = count;
 343         for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) {
 344                 status = nfsd4_decode_nfsace4(argp, ace);
 345                 if (status)
 346                         return status;
 347         }
 348
 349         return nfs_ok;
 350 }
 351
 352 static noinline __be32
 353 nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
 354                             struct xdr_netobj *label)
 355 {
 356         u32 lfs, pi, length;
 357         __be32 *p;
 358
 359         if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0)
 360                 return nfserr_bad_xdr;
 361         if (xdr_stream_decode_u32(argp->xdr, &pi) < 0)
 362                 return nfserr_bad_xdr;
 363
 364         if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
 365                 return nfserr_bad_xdr;
 366         if (length > NFS4_MAXLABELLEN)
 367                 return nfserr_badlabel;
 368         p = xdr_inline_decode(argp->xdr, length);
 369         if (!p)
 370                 return nfserr_bad_xdr;
 371         label->len = length;
 372         label->data = svcxdr_dupstr(argp, p, length);
 373         if (!label->data)
 374                 return nfserr_jukebox;
 375
 376         return nfs_ok;
 377 }
 378
 379 static __be32
 380 nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
 381                     struct iattr *iattr, struct nfs4_acl **acl,
 382                     struct xdr_netobj *label, int *umask)
 383 {
 384         unsigned int starting_pos;
 385         u32 attrlist4_count;
 386         __be32 *p, status;
 387
 388         iattr->ia_valid = 0;
 389         status = nfsd4_decode_bitmap4(argp, bmval, bmlen);
 390         if (status)
 391                 return nfserr_bad_xdr;
 392
 393         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 394             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 395             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
 396                 if (nfsd_attrs_supported(argp->minorversion, bmval))
 397                         return nfserr_inval;
 398                 return nfserr_attrnotsupp;
 399         }
 400
 401         if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0)
 402                 return nfserr_bad_xdr;
 403         starting_pos = xdr_stream_pos(argp->xdr);
 404
 405         if (bmval[0] & FATTR4_WORD0_SIZE) {
 406                 u64 size;
 407
 408                 if (xdr_stream_decode_u64(argp->xdr, &size) < 0)
 409                         return nfserr_bad_xdr;
 410                 iattr->ia_size = size;
 411                 iattr->ia_valid |= ATTR_SIZE;
 412         }
 413         if (bmval[0] & FATTR4_WORD0_ACL) {
 414                 status = nfsd4_decode_acl(argp, acl);
 415                 if (status)
 416                         return status;
 417         } else
 418                 *acl = NULL;
 419         if (bmval[1] & FATTR4_WORD1_MODE) {
 420                 u32 mode;
 421
 422                 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
 423                         return nfserr_bad_xdr;
 424                 iattr->ia_mode = mode;
 425                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 426                 iattr->ia_valid |= ATTR_MODE;
 427         }
 428         if (bmval[1] & FATTR4_WORD1_OWNER) {
 429                 u32 length;
 430
 431                 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
 432                         return nfserr_bad_xdr;
 433                 p = xdr_inline_decode(argp->xdr, length);
 434                 if (!p)
 435                         return nfserr_bad_xdr;
 436                 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length,
 437                                               &iattr->ia_uid);
 438                 if (status)
 439                         return status;
 440                 iattr->ia_valid |= ATTR_UID;
 441         }
 442         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 443                 u32 length;
 444
 445                 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
 446                         return nfserr_bad_xdr;
 447                 p = xdr_inline_decode(argp->xdr, length);
 448                 if (!p)
 449                         return nfserr_bad_xdr;
 450                 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length,
 451                                               &iattr->ia_gid);
 452                 if (status)
 453                         return status;
 454                 iattr->ia_valid |= ATTR_GID;
 455         }
 456         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 457                 u32 set_it;
 458
 459                 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
 460                         return nfserr_bad_xdr;
 461                 switch (set_it) {
 462                 case NFS4_SET_TO_CLIENT_TIME:
 463                         status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime);
 464                         if (status)
 465                                 return status;
 466                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 467                         break;
 468                 case NFS4_SET_TO_SERVER_TIME:
 469                         iattr->ia_valid |= ATTR_ATIME;
 470                         break;
 471                 default:
 472                         return nfserr_bad_xdr;
 473                 }
 474         }
 475         if (bmval[1] & FATTR4_WORD1_TIME_CREATE) {
 476                 struct timespec64 ts;
 477
 478                 /* No Linux filesystem supports setting this attribute. */
 479                 bmval[1] &= ~FATTR4_WORD1_TIME_CREATE;
 480                 status = nfsd4_decode_nfstime4(argp, &ts);
 481                 if (status)
 482                         return status;
 483         }
 484         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 485                 u32 set_it;
 486
 487                 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
 488                         return nfserr_bad_xdr;
 489                 switch (set_it) {
 490                 case NFS4_SET_TO_CLIENT_TIME:
 491                         status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime);
 492                         if (status)
 493                                 return status;
 494                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 495                         break;
 496                 case NFS4_SET_TO_SERVER_TIME:
 497                         iattr->ia_valid |= ATTR_MTIME;
 498                         break;
 499                 default:
 500                         return nfserr_bad_xdr;
 501                 }
 502         }
 503         label->len = 0;
 504         if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
 505             bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
 506                 status = nfsd4_decode_security_label(argp, label);
 507                 if (status)
 508                         return status;
 509         }
 510         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
 511                 u32 mode, mask;
 512
 513                 if (!umask)
 514                         return nfserr_bad_xdr;
 515                 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
 516                         return nfserr_bad_xdr;
 517                 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO);
 518                 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0)
 519                         return nfserr_bad_xdr;
 520                 *umask = mask & S_IRWXUGO;
 521                 iattr->ia_valid |= ATTR_MODE;
 522         }
 523
 524         /* request sanity: did attrlist4 contain the expected number of words? */
 525         if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos)
 526                 return nfserr_bad_xdr;
 527
 528         return nfs_ok;
 529 }
 530
 531 static __be32
 532 nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
 533 {
 534         __be32 *p;
 535
 536         p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE);
 537         if (!p)
 538                 return nfserr_bad_xdr;
 539         sid->si_generation = be32_to_cpup(p++);
 540         memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque));
 541         return nfs_ok;
 542 }
 543
 544 static __be32
 545 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 546 {
 547         __be32 *p;
 548
 549         p = xdr_inline_decode(argp->xdr, sizeof(__be64));
 550         if (!p)
 551                 return nfserr_bad_xdr;
 552         memcpy(clientid, p, sizeof(*clientid));
 553         return nfs_ok;
 554 }
 555
 556 static __be32
 557 nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
 558                           clientid_t *clientid, struct xdr_netobj *owner)
 559 {
 560         __be32 status;
 561
 562         status = nfsd4_decode_clientid4(argp, clientid);
 563         if (status)
 564                 return status;
 565         return nfsd4_decode_opaque(argp, owner);
 566 }
 567
 568 #ifdef CONFIG_NFSD_PNFS
 569 static __be32
 570 nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
 571                        struct nfsd4_deviceid *devid)
 572 {
 573         __be32 *p;
 574
 575         p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE);
 576         if (!p)
 577                 return nfserr_bad_xdr;
 578         memcpy(devid, p, sizeof(*devid));
 579         return nfs_ok;
 580 }
 581
 582 static __be32
 583 nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
 584                            struct nfsd4_layoutcommit *lcp)
 585 {
 586         if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0)
 587                 return nfserr_bad_xdr;
 588         if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
 589                 return nfserr_bad_xdr;
 590         if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
 591                 return nfserr_bad_xdr;
 592
 593         if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0)
 594                 return nfserr_bad_xdr;
 595         if (lcp->lc_up_len > 0) {
 596                 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len);
 597                 if (!lcp->lc_up_layout)
 598                         return nfserr_bad_xdr;
 599         }
 600
 601         return nfs_ok;
 602 }
 603
 604 static __be32
 605 nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp,
 606                            struct nfsd4_layoutreturn *lrp)
 607 {
 608         __be32 status;
 609
 610         if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0)
 611                 return nfserr_bad_xdr;
 612         switch (lrp->lr_return_type) {
 613         case RETURN_FILE:
 614                 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0)
 615                         return nfserr_bad_xdr;
 616                 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0)
 617                         return nfserr_bad_xdr;
 618                 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid);
 619                 if (status)
 620                         return status;
 621                 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0)
 622                         return nfserr_bad_xdr;
 623                 if (lrp->lrf_body_len > 0) {
 624                         lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len);
 625                         if (!lrp->lrf_body)
 626                                 return nfserr_bad_xdr;
 627                 }
 628                 break;
 629         case RETURN_FSID:
 630         case RETURN_ALL:
 631                 lrp->lr_seg.offset = 0;
 632                 lrp->lr_seg.length = NFS4_MAX_UINT64;
 633                 break;
 634         default:
 635                 return nfserr_bad_xdr;
 636         }
 637
 638         return nfs_ok;
 639 }
 640
 641 #endif /* CONFIG_NFSD_PNFS */
 642
 643 static __be32
 644 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
 645                         struct nfs4_sessionid *sessionid)
 646 {
 647         __be32 *p;
 648
 649         p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN);
 650         if (!p)
 651                 return nfserr_bad_xdr;
 652         memcpy(sessionid->data, p, sizeof(sessionid->data));
 653         return nfs_ok;
 654 }
 655
 656 /* Defined in Appendix A of RFC 5531 */
 657 static __be32
 658 nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
 659                            struct nfsd4_cb_sec *cbs)
 660 {
 661         u32 stamp, gidcount, uid, gid;
 662         __be32 *p, status;
 663
 664         if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0)
 665                 return nfserr_bad_xdr;
 666         /* machine name */
 667         status = nfsd4_decode_ignored_string(argp, 255);
 668         if (status)
 669                 return status;
 670         if (xdr_stream_decode_u32(argp->xdr, &uid) < 0)
 671                 return nfserr_bad_xdr;
 672         if (xdr_stream_decode_u32(argp->xdr, &gid) < 0)
 673                 return nfserr_bad_xdr;
 674         if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0)
 675                 return nfserr_bad_xdr;
 676         if (gidcount > 16)
 677                 return nfserr_bad_xdr;
 678         p = xdr_inline_decode(argp->xdr, gidcount << 2);
 679         if (!p)
 680                 return nfserr_bad_xdr;
 681         if (cbs->flavor == (u32)(-1)) {
 682                 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
 683
 684                 kuid_t kuid = make_kuid(userns, uid);
 685                 kgid_t kgid = make_kgid(userns, gid);
 686                 if (uid_valid(kuid) && gid_valid(kgid)) {
 687                         cbs->uid = kuid;
 688                         cbs->gid = kgid;
 689                         cbs->flavor = RPC_AUTH_UNIX;
 690                 } else {
 691                         dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
 692                 }
 693         }
 694
 695         return nfs_ok;
 696 }
 697
 698 static __be32
 699 nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
 700                              struct nfsd4_cb_sec *cbs)
 701 {
 702         __be32 status;
 703         u32 service;
 704
 705         dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
 706
 707         if (xdr_stream_decode_u32(argp->xdr, &service) < 0)
 708                 return nfserr_bad_xdr;
 709         if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
 710                 return nfserr_bad_xdr;
 711         /* gcbp_handle_from_server */
 712         status = nfsd4_decode_ignored_string(argp, 0);
 713         if (status)
 714                 return status;
 715         /* gcbp_handle_from_client */
 716         status = nfsd4_decode_ignored_string(argp, 0);
 717         if (status)
 718                 return status;
 719
 720         return nfs_ok;
 721 }
 722
 723 /* a counted array of callback_sec_parms4 items */
 724 static __be32
 725 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 726 {
 727         u32 i, secflavor, nr_secflavs;
 728         __be32 status;
 729
 730         /* callback_sec_params4 */
 731         if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0)
 732                 return nfserr_bad_xdr;
 733         if (nr_secflavs)
 734                 cbs->flavor = (u32)(-1);
 735         else
 736                 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
 737                 cbs->flavor = 0;
 738
 739         for (i = 0; i < nr_secflavs; ++i) {
 740                 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0)
 741                         return nfserr_bad_xdr;
 742                 switch (secflavor) {
 743                 case RPC_AUTH_NULL:
 744                         /* void */
 745                         if (cbs->flavor == (u32)(-1))
 746                                 cbs->flavor = RPC_AUTH_NULL;
 747                         break;
 748                 case RPC_AUTH_UNIX:
 749                         status = nfsd4_decode_authsys_parms(argp, cbs);
 750                         if (status)
 751                                 return status;
 752                         break;
 753                 case RPC_AUTH_GSS:
 754                         status = nfsd4_decode_gss_cb_handles4(argp, cbs);
 755                         if (status)
 756                                 return status;
 757                         break;
 758                 default:
 759                         return nfserr_inval;
 760                 }
 761         }
 762
 763         return nfs_ok;
 764 }
 765
 766
 767 /*
 768  * NFSv4 operation argument decoders
 769  */
 770
 771 static __be32
 772 nfsd4_decode_access(struct nfsd4_compoundargs *argp,
 773                     union nfsd4_op_u *u)
 774 {
 775         struct nfsd4_access *access = &u->access;
 776         if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
 777                 return nfserr_bad_xdr;
 778         return nfs_ok;
 779 }
 780
 781 static __be32
 782 nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 783 {
 784         struct nfsd4_close *close = &u->close;
 785         if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0)
 786                 return nfserr_bad_xdr;
 787         return nfsd4_decode_stateid4(argp, &close->cl_stateid);
 788 }
 789
 790
 791 static __be32
 792 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 793 {
 794         struct nfsd4_commit *commit = &u->commit;
 795         if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0)
 796                 return nfserr_bad_xdr;
 797         if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0)
 798                 return nfserr_bad_xdr;
 799         memset(&commit->co_verf, 0, sizeof(commit->co_verf));
 800         return nfs_ok;
 801 }
 802
 803 static __be32
 804 nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 805 {
 806         struct nfsd4_create *create = &u->create;
 807         __be32 *p, status;
 808
 809         memset(create, 0, sizeof(*create));
 810         if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0)
 811                 return nfserr_bad_xdr;
 812         switch (create->cr_type) {
 813         case NF4LNK:
 814                 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0)
 815                         return nfserr_bad_xdr;
 816                 p = xdr_inline_decode(argp->xdr, create->cr_datalen);
 817                 if (!p)
 818                         return nfserr_bad_xdr;
 819                 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
 820                 if (!create->cr_data)
 821                         return nfserr_jukebox;
 822                 break;
 823         case NF4BLK:
 824         case NF4CHR:
 825                 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0)
 826                         return nfserr_bad_xdr;
 827                 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0)
 828                         return nfserr_bad_xdr;
 829                 break;
 830         case NF4SOCK:
 831         case NF4FIFO:
 832         case NF4DIR:
 833         default:
 834                 break;
 835         }
 836         status = nfsd4_decode_component4(argp, &create->cr_name,
 837                                          &create->cr_namelen);
 838         if (status)
 839                 return status;
 840         status = nfsd4_decode_fattr4(argp, create->cr_bmval,
 841                                     ARRAY_SIZE(create->cr_bmval),
 842                                     &create->cr_iattr, &create->cr_acl,
 843                                     &create->cr_label, &create->cr_umask);
 844         if (status)
 845                 return status;
 846
 847         return nfs_ok;
 848 }
 849
 850 static inline __be32
 851 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 852 {
 853         struct nfsd4_delegreturn *dr = &u->delegreturn;
 854         return nfsd4_decode_stateid4(argp, &dr->dr_stateid);
 855 }
 856
 857 static inline __be32
 858 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 859 {
 860         struct nfsd4_getattr *getattr = &u->getattr;
 861         memset(getattr, 0, sizeof(*getattr));
 862         return nfsd4_decode_bitmap4(argp, getattr->ga_bmval,
 863                                     ARRAY_SIZE(getattr->ga_bmval));
 864 }
 865
 866 static __be32
 867 nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 868 {
 869         struct nfsd4_link *link = &u->link;
 870         memset(link, 0, sizeof(*link));
 871         return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
 872 }
 873
 874 static __be32
 875 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
 876                                  struct nfsd4_lock *lock)
 877 {
 878         __be32 status;
 879
 880         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
 881                 return nfserr_bad_xdr;
 882         status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
 883         if (status)
 884                 return status;
 885         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
 886                 return nfserr_bad_xdr;
 887         return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
 888                                          &lock->lk_new_owner);
 889 }
 890
 891 static __be32
 892 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
 893                                struct nfsd4_lock *lock)
 894 {
 895         __be32 status;
 896
 897         status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
 898         if (status)
 899                 return status;
 900         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
 901                 return nfserr_bad_xdr;
 902
 903         return nfs_ok;
 904 }
 905
 906 static __be32
 907 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 908 {
 909         if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
 910                 return nfserr_bad_xdr;
 911         if (lock->lk_is_new)
 912                 return nfsd4_decode_open_to_lock_owner4(argp, lock);
 913         return nfsd4_decode_exist_lock_owner4(argp, lock);
 914 }
 915
 916 static __be32
 917 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 918 {
 919         struct nfsd4_lock *lock = &u->lock;
 920         memset(lock, 0, sizeof(*lock));
 921         if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
 922                 return nfserr_bad_xdr;
 923         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 924                 return nfserr_bad_xdr;
 925         if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0)
 926                 return nfserr_bad_xdr;
 927         if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
 928                 return nfserr_bad_xdr;
 929         if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
 930                 return nfserr_bad_xdr;
 931         return nfsd4_decode_locker4(argp, lock);
 932 }
 933
 934 static __be32
 935 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 936 {
 937         struct nfsd4_lockt *lockt = &u->lockt;
 938         memset(lockt, 0, sizeof(*lockt));
 939         if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0)
 940                 return nfserr_bad_xdr;
 941         if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 942                 return nfserr_bad_xdr;
 943         if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0)
 944                 return nfserr_bad_xdr;
 945         if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0)
 946                 return nfserr_bad_xdr;
 947         return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid,
 948                                          &lockt->lt_owner);
 949 }
 950
 951 static __be32
 952 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 953 {
 954         struct nfsd4_locku *locku = &u->locku;
 955         __be32 status;
 956
 957         if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0)
 958                 return nfserr_bad_xdr;
 959         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 960                 return nfserr_bad_xdr;
 961         if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0)
 962                 return nfserr_bad_xdr;
 963         status = nfsd4_decode_stateid4(argp, &locku->lu_stateid);
 964         if (status)
 965                 return status;
 966         if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0)
 967                 return nfserr_bad_xdr;
 968         if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0)
 969                 return nfserr_bad_xdr;
 970
 971         return nfs_ok;
 972 }
 973
 974 static __be32
 975 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
 976 {
 977         struct nfsd4_lookup *lookup = &u->lookup;
 978         return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len);
 979 }
 980
 981 static __be32
 982 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 983 {
 984         __be32 status;
 985
 986         if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0)
 987                 return nfserr_bad_xdr;
 988         switch (open->op_createmode) {
 989         case NFS4_CREATE_UNCHECKED:
 990         case NFS4_CREATE_GUARDED:
 991                 status = nfsd4_decode_fattr4(argp, open->op_bmval,
 992                                              ARRAY_SIZE(open->op_bmval),
 993                                              &open->op_iattr, &open->op_acl,
 994                                              &open->op_label, &open->op_umask);
 995                 if (status)
 996                         return status;
 997                 break;
 998         case NFS4_CREATE_EXCLUSIVE:
 999                 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1000                 if (status)
1001                         return status;
1002                 break;
1003         case NFS4_CREATE_EXCLUSIVE4_1:
1004                 if (argp->minorversion < 1)
1005                         return nfserr_bad_xdr;
1006                 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1007                 if (status)
1008                         return status;
1009                 status = nfsd4_decode_fattr4(argp, open->op_bmval,
1010                                              ARRAY_SIZE(open->op_bmval),
1011                                              &open->op_iattr, &open->op_acl,
1012                                              &open->op_label, &open->op_umask);
1013                 if (status)
1014                         return status;
1015                 break;
1016         default:
1017                 return nfserr_bad_xdr;
1018         }
1019
1020         return nfs_ok;
1021 }
1022
1023 static __be32
1024 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1025 {
1026         __be32 status;
1027
1028         if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0)
1029                 return nfserr_bad_xdr;
1030         switch (open->op_create) {
1031         case NFS4_OPEN_NOCREATE:
1032                 break;
1033         case NFS4_OPEN_CREATE:
1034                 status = nfsd4_decode_createhow4(argp, open);
1035                 if (status)
1036                         return status;
1037                 break;
1038         default:
1039                 return nfserr_bad_xdr;
1040         }
1041
1042         return nfs_ok;
1043 }
1044
1045 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
1046 {
1047         u32 w;
1048
1049         if (xdr_stream_decode_u32(argp->xdr, &w) < 0)
1050                 return nfserr_bad_xdr;
1051         *share_access = w & NFS4_SHARE_ACCESS_MASK;
1052         *deleg_want = w & NFS4_SHARE_WANT_MASK;
1053         if (deleg_when)
1054                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
1055
1056         switch (w & NFS4_SHARE_ACCESS_MASK) {
1057         case NFS4_SHARE_ACCESS_READ:
1058         case NFS4_SHARE_ACCESS_WRITE:
1059         case NFS4_SHARE_ACCESS_BOTH:
1060                 break;
1061         default:
1062                 return nfserr_bad_xdr;
1063         }
1064         w &= ~NFS4_SHARE_ACCESS_MASK;
1065         if (!w)
1066                 return nfs_ok;
1067         if (!argp->minorversion)
1068                 return nfserr_bad_xdr;
1069         switch (w & NFS4_SHARE_WANT_MASK) {
1070         case NFS4_SHARE_WANT_NO_PREFERENCE:
1071         case NFS4_SHARE_WANT_READ_DELEG:
1072         case NFS4_SHARE_WANT_WRITE_DELEG:
1073         case NFS4_SHARE_WANT_ANY_DELEG:
1074         case NFS4_SHARE_WANT_NO_DELEG:
1075         case NFS4_SHARE_WANT_CANCEL:
1076                 break;
1077         default:
1078                 return nfserr_bad_xdr;
1079         }
1080         w &= ~NFS4_SHARE_WANT_MASK;
1081         if (!w)
1082                 return nfs_ok;
1083
1084         if (!deleg_when)        /* open_downgrade */
1085                 return nfserr_inval;
1086         switch (w) {
1087         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
1088         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
1089         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
1090               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
1091                 return nfs_ok;
1092         }
1093         return nfserr_bad_xdr;
1094 }
1095
1096 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
1097 {
1098         if (xdr_stream_decode_u32(argp->xdr, x) < 0)
1099                 return nfserr_bad_xdr;
1100         /* Note: unlike access bits, deny bits may be zero. */
1101         if (*x & ~NFS4_SHARE_DENY_BOTH)
1102                 return nfserr_bad_xdr;
1103
1104         return nfs_ok;
1105 }
1106
1107 static __be32
1108 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
1109                          struct nfsd4_open *open)
1110 {
1111         __be32 status;
1112
1113         if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
1114                 return nfserr_bad_xdr;
1115         switch (open->op_claim_type) {
1116         case NFS4_OPEN_CLAIM_NULL:
1117         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1118                 status = nfsd4_decode_component4(argp, &open->op_fname,
1119                                                  &open->op_fnamelen);
1120                 if (status)
1121                         return status;
1122                 break;
1123         case NFS4_OPEN_CLAIM_PREVIOUS:
1124                 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
1125                         return nfserr_bad_xdr;
1126                 break;
1127         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1128                 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1129                 if (status)
1130                         return status;
1131                 status = nfsd4_decode_component4(argp, &open->op_fname,
1132                                                  &open->op_fnamelen);
1133                 if (status)
1134                         return status;
1135                 break;
1136         case NFS4_OPEN_CLAIM_FH:
1137         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1138                 if (argp->minorversion < 1)
1139                         return nfserr_bad_xdr;
1140                 /* void */
1141                 break;
1142         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1143                 if (argp->minorversion < 1)
1144                         return nfserr_bad_xdr;
1145                 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1146                 if (status)
1147                         return status;
1148                 break;
1149         default:
1150                 return nfserr_bad_xdr;
1151         }
1152
1153         return nfs_ok;
1154 }
1155
1156 static __be32
1157 nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1158 {
1159         struct nfsd4_open *open = &u->open;
1160         __be32 status;
1161         u32 dummy;
1162
1163         memset(open, 0, sizeof(*open));
1164
1165         if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0)
1166                 return nfserr_bad_xdr;
1167         /* deleg_want is ignored */
1168         status = nfsd4_decode_share_access(argp, &open->op_share_access,
1169                                            &open->op_deleg_want, &dummy);
1170         if (status)
1171                 return status;
1172         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
1173         if (status)
1174                 return status;
1175         status = nfsd4_decode_state_owner4(argp, &open->op_clientid,
1176                                            &open->op_owner);
1177         if (status)
1178                 return status;
1179         status = nfsd4_decode_openflag4(argp, open);
1180         if (status)
1181                 return status;
1182         return nfsd4_decode_open_claim4(argp, open);
1183 }
1184
1185 static __be32
1186 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp,
1187                           union nfsd4_op_u *u)
1188 {
1189         struct nfsd4_open_confirm *open_conf = &u->open_confirm;
1190         __be32 status;
1191
1192         if (argp->minorversion >= 1)
1193                 return nfserr_notsupp;
1194
1195         status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid);
1196         if (status)
1197                 return status;
1198         if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0)
1199                 return nfserr_bad_xdr;
1200
1201         memset(&open_conf->oc_resp_stateid, 0,
1202                sizeof(open_conf->oc_resp_stateid));
1203         return nfs_ok;
1204 }
1205
1206 static __be32
1207 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp,
1208                             union nfsd4_op_u *u)
1209 {
1210         struct nfsd4_open_downgrade *open_down = &u->open_downgrade;
1211         __be32 status;
1212
1213         memset(open_down, 0, sizeof(*open_down));
1214         status = nfsd4_decode_stateid4(argp, &open_down->od_stateid);
1215         if (status)
1216                 return status;
1217         if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0)
1218                 return nfserr_bad_xdr;
1219         /* deleg_want is ignored */
1220         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1221                                            &open_down->od_deleg_want, NULL);
1222         if (status)
1223                 return status;
1224         return nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1225 }
1226
1227 static __be32
1228 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1229 {
1230         struct nfsd4_putfh *putfh = &u->putfh;
1231         __be32 *p;
1232
1233         if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0)
1234                 return nfserr_bad_xdr;
1235         if (putfh->pf_fhlen > NFS4_FHSIZE)
1236                 return nfserr_bad_xdr;
1237         p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen);
1238         if (!p)
1239                 return nfserr_bad_xdr;
1240         putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen);
1241         if (!putfh->pf_fhval)
1242                 return nfserr_jukebox;
1243
1244         putfh->no_verify = false;
1245         return nfs_ok;
1246 }
1247
1248 static __be32
1249 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
1250 {
1251         if (argp->minorversion == 0)
1252                 return nfs_ok;
1253         return nfserr_notsupp;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1258 {
1259         struct nfsd4_read *read = &u->read;
1260         __be32 status;
1261
1262         memset(read, 0, sizeof(*read));
1263         status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
1264         if (status)
1265                 return status;
1266         if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
1267                 return nfserr_bad_xdr;
1268         if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
1269                 return nfserr_bad_xdr;
1270
1271         return nfs_ok;
1272 }
1273
1274 static __be32
1275 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1276 {
1277         struct nfsd4_readdir *readdir = &u->readdir;
1278         __be32 status;
1279
1280         memset(readdir, 0, sizeof(*readdir));
1281         if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
1282                 return nfserr_bad_xdr;
1283         status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
1284         if (status)
1285                 return status;
1286         if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
1287                 return nfserr_bad_xdr;
1288         if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
1289                 return nfserr_bad_xdr;
1290         if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
1291                                            ARRAY_SIZE(readdir->rd_bmval)) < 0)
1292                 return nfserr_bad_xdr;
1293
1294         return nfs_ok;
1295 }
1296
1297 static __be32
1298 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1299 {
1300         struct nfsd4_remove *remove = &u->remove;
1301         memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
1302         return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
1303 }
1304
1305 static __be32
1306 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1307 {
1308         struct nfsd4_rename *rename = &u->rename;
1309         __be32 status;
1310
1311         memset(rename, 0, sizeof(*rename));
1312         status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
1313         if (status)
1314                 return status;
1315         return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
1316 }
1317
1318 static __be32
1319 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1320 {
1321         clientid_t *clientid = &u->renew;
1322         return nfsd4_decode_clientid4(argp, clientid);
1323 }
1324
1325 static __be32
1326 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1327                      union nfsd4_op_u *u)
1328 {
1329         struct nfsd4_secinfo *secinfo = &u->secinfo;
1330         secinfo->si_exp = NULL;
1331         return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
1332 }
1333
1334 static __be32
1335 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1336 {
1337         struct nfsd4_setattr *setattr = &u->setattr;
1338         __be32 status;
1339
1340         memset(setattr, 0, sizeof(*setattr));
1341         status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
1342         if (status)
1343                 return status;
1344         return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
1345                                    ARRAY_SIZE(setattr->sa_bmval),
1346                                    &setattr->sa_iattr, &setattr->sa_acl,
1347                                    &setattr->sa_label, NULL);
1348 }
1349
1350 static __be32
1351 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1352 {
1353         struct nfsd4_setclientid *setclientid = &u->setclientid;
1354         __be32 *p, status;
1355
1356         memset(setclientid, 0, sizeof(*setclientid));
1357
1358         if (argp->minorversion >= 1)
1359                 return nfserr_notsupp;
1360
1361         status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
1362         if (status)
1363                 return status;
1364         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1365         if (status)
1366                 return status;
1367         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
1368                 return nfserr_bad_xdr;
1369         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
1370                 return nfserr_bad_xdr;
1371         p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
1372         if (!p)
1373                 return nfserr_bad_xdr;
1374         setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
1375                                                 setclientid->se_callback_netid_len);
1376         if (!setclientid->se_callback_netid_val)
1377                 return nfserr_jukebox;
1378
1379         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
1380                 return nfserr_bad_xdr;
1381         p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
1382         if (!p)
1383                 return nfserr_bad_xdr;
1384         setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
1385                                                 setclientid->se_callback_addr_len);
1386         if (!setclientid->se_callback_addr_val)
1387                 return nfserr_jukebox;
1388         if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
1389                 return nfserr_bad_xdr;
1390
1391         return nfs_ok;
1392 }
1393
1394 static __be32
1395 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp,
1396                                  union nfsd4_op_u *u)
1397 {
1398         struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm;
1399         __be32 status;
1400
1401         if (argp->minorversion >= 1)
1402                 return nfserr_notsupp;
1403
1404         status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
1405         if (status)
1406                 return status;
1407         return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
1408 }
1409
1410 /* Also used for NVERIFY */
1411 static __be32
1412 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1413 {
1414         struct nfsd4_verify *verify = &u->verify;
1415         __be32 *p, status;
1416
1417         memset(verify, 0, sizeof(*verify));
1418
1419         status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
1420                                       ARRAY_SIZE(verify->ve_bmval));
1421         if (status)
1422                 return status;
1423
1424         /* For convenience's sake, we compare raw xdr'd attributes in
1425          * nfsd4_proc_verify */
1426
1427         if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
1428                 return nfserr_bad_xdr;
1429         p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
1430         if (!p)
1431                 return nfserr_bad_xdr;
1432         verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen);
1433         if (!verify->ve_attrval)
1434                 return nfserr_jukebox;
1435
1436         return nfs_ok;
1437 }
1438
1439 static __be32
1440 nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1441 {
1442         struct nfsd4_write *write = &u->write;
1443         __be32 status;
1444
1445         status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
1446         if (status)
1447                 return status;
1448         if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
1449                 return nfserr_bad_xdr;
1450         if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
1451                 return nfserr_bad_xdr;
1452         if (write->wr_stable_how > NFS_FILE_SYNC)
1453                 return nfserr_bad_xdr;
1454         if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
1455                 return nfserr_bad_xdr;
1456         if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
1457                 return nfserr_bad_xdr;
1458
1459         write->wr_bytes_written = 0;
1460         write->wr_how_written = 0;
1461         memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
1462         return nfs_ok;
1463 }
1464
1465 static __be32
1466 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp,
1467                                union nfsd4_op_u *u)
1468 {
1469         struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
1470         __be32 status;
1471
1472         if (argp->minorversion >= 1)
1473                 return nfserr_notsupp;
1474
1475         status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
1476                                            &rlockowner->rl_owner);
1477         if (status)
1478                 return status;
1479
1480         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1481                 return nfserr_inval;
1482
1483         return nfs_ok;
1484 }
1485
1486 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp,
1487                                            union nfsd4_op_u *u)
1488 {
1489         struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
1490         memset(bc, 0, sizeof(*bc));
1491         if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
1492                 return nfserr_bad_xdr;
1493         return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
1494 }
1495
1496 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp,
1497                                                 union nfsd4_op_u *u)
1498 {
1499         struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
1500         u32 use_conn_in_rdma_mode;
1501         __be32 status;
1502
1503         memset(bcts, 0, sizeof(*bcts));
1504         status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
1505         if (status)
1506                 return status;
1507         if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
1508                 return nfserr_bad_xdr;
1509         if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
1510                 return nfserr_bad_xdr;
1511
1512         return nfs_ok;
1513 }
1514
1515 static __be32
1516 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1517                                struct nfsd4_exchange_id *exid)
1518 {
1519         __be32 status;
1520
1521         status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
1522                                       ARRAY_SIZE(exid->spo_must_enforce));
1523         if (status)
1524                 return nfserr_bad_xdr;
1525         status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
1526                                       ARRAY_SIZE(exid->spo_must_allow));
1527         if (status)
1528                 return nfserr_bad_xdr;
1529
1530         return nfs_ok;
1531 }
1532
1533 /*
1534  * This implementation currently does not support SP4_SSV.
1535  * This decoder simply skips over these arguments.
1536  */
1537 static noinline __be32
1538 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1539                           struct nfsd4_exchange_id *exid)
1540 {
1541         u32 count, window, num_gss_handles;
1542         __be32 status;
1543
1544         /* ssp_ops */
1545         status = nfsd4_decode_state_protect_ops(argp, exid);
1546         if (status)
1547                 return status;
1548
1549         /* ssp_hash_algs<> */
1550         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1551                 return nfserr_bad_xdr;
1552         while (count--) {
1553                 status = nfsd4_decode_ignored_string(argp, 0);
1554                 if (status)
1555                         return status;
1556         }
1557
1558         /* ssp_encr_algs<> */
1559         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1560                 return nfserr_bad_xdr;
1561         while (count--) {
1562                 status = nfsd4_decode_ignored_string(argp, 0);
1563                 if (status)
1564                         return status;
1565         }
1566
1567         if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
1568                 return nfserr_bad_xdr;
1569         if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
1570                 return nfserr_bad_xdr;
1571
1572         return nfs_ok;
1573 }
1574
1575 static __be32
1576 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1577                               struct nfsd4_exchange_id *exid)
1578 {
1579         __be32 status;
1580
1581         if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
1582                 return nfserr_bad_xdr;
1583         switch (exid->spa_how) {
1584         case SP4_NONE:
1585                 break;
1586         case SP4_MACH_CRED:
1587                 status = nfsd4_decode_state_protect_ops(argp, exid);
1588                 if (status)
1589                         return status;
1590                 break;
1591         case SP4_SSV:
1592                 status = nfsd4_decode_ssv_sp_parms(argp, exid);
1593                 if (status)
1594                         return status;
1595                 break;
1596         default:
1597                 return nfserr_bad_xdr;
1598         }
1599
1600         return nfs_ok;
1601 }
1602
1603 static __be32
1604 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1605                           struct nfsd4_exchange_id *exid)
1606 {
1607         __be32 status;
1608         u32 count;
1609
1610         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1611                 return nfserr_bad_xdr;
1612         switch (count) {
1613         case 0:
1614                 break;
1615         case 1:
1616                 /* Note that RFC 8881 places no length limit on
1617                  * nii_domain, but this implementation permits no
1618                  * more than NFS4_OPAQUE_LIMIT bytes */
1619                 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1620                 if (status)
1621                         return status;
1622                 /* Note that RFC 8881 places no length limit on
1623                  * nii_name, but this implementation permits no
1624                  * more than NFS4_OPAQUE_LIMIT bytes */
1625                 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1626                 if (status)
1627                         return status;
1628                 status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
1629                 if (status)
1630                         return status;
1631                 break;
1632         default:
1633                 return nfserr_bad_xdr;
1634         }
1635
1636         return nfs_ok;
1637 }
1638
1639 static __be32
1640 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1641                          union nfsd4_op_u *u)
1642 {
1643         struct nfsd4_exchange_id *exid = &u->exchange_id;
1644         __be32 status;
1645
1646         memset(exid, 0, sizeof(*exid));
1647         status = nfsd4_decode_verifier4(argp, &exid->verifier);
1648         if (status)
1649                 return status;
1650         status = nfsd4_decode_opaque(argp, &exid->clname);
1651         if (status)
1652                 return status;
1653         if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
1654                 return nfserr_bad_xdr;
1655         status = nfsd4_decode_state_protect4_a(argp, exid);
1656         if (status)
1657                 return status;
1658         return nfsd4_decode_nfs_impl_id4(argp, exid);
1659 }
1660
1661 static __be32
1662 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1663                             struct nfsd4_channel_attrs *ca)
1664 {
1665         __be32 *p;
1666
1667         p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
1668         if (!p)
1669                 return nfserr_bad_xdr;
1670
1671         /* headerpadsz is ignored */
1672         p++;
1673         ca->maxreq_sz = be32_to_cpup(p++);
1674         ca->maxresp_sz = be32_to_cpup(p++);
1675         ca->maxresp_cached = be32_to_cpup(p++);
1676         ca->maxops = be32_to_cpup(p++);
1677         ca->maxreqs = be32_to_cpup(p++);
1678         ca->nr_rdma_attrs = be32_to_cpup(p);
1679         switch (ca->nr_rdma_attrs) {
1680         case 0:
1681                 break;
1682         case 1:
1683                 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
1684                         return nfserr_bad_xdr;
1685                 break;
1686         default:
1687                 return nfserr_bad_xdr;
1688         }
1689
1690         return nfs_ok;
1691 }
1692
1693 static __be32
1694 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1695                             union nfsd4_op_u *u)
1696 {
1697         struct nfsd4_create_session *sess = &u->create_session;
1698         __be32 status;
1699
1700         memset(sess, 0, sizeof(*sess));
1701         status = nfsd4_decode_clientid4(argp, &sess->clientid);
1702         if (status)
1703                 return status;
1704         if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
1705                 return nfserr_bad_xdr;
1706         if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
1707                 return nfserr_bad_xdr;
1708         status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
1709         if (status)
1710                 return status;
1711         status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
1712         if (status)
1713                 return status;
1714         if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
1715                 return nfserr_bad_xdr;
1716         return nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1717 }
1718
1719 static __be32
1720 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1721                              union nfsd4_op_u *u)
1722 {
1723         struct nfsd4_destroy_session *destroy_session = &u->destroy_session;
1724         return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
1725 }
1726
1727 static __be32
1728 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1729                           union nfsd4_op_u *u)
1730 {
1731         struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
1732         return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
1733 }
1734
1735 #ifdef CONFIG_NFSD_PNFS
1736 static __be32
1737 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1738                 union nfsd4_op_u *u)
1739 {
1740         struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
1741         __be32 status;
1742
1743         memset(gdev, 0, sizeof(*gdev));
1744         status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
1745         if (status)
1746                 return status;
1747         if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
1748                 return nfserr_bad_xdr;
1749         if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
1750                 return nfserr_bad_xdr;
1751         if (xdr_stream_decode_uint32_array(argp->xdr,
1752                                            &gdev->gd_notify_types, 1) < 0)
1753                 return nfserr_bad_xdr;
1754
1755         return nfs_ok;
1756 }
1757
1758 static __be32
1759 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1760                           union nfsd4_op_u *u)
1761 {
1762         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1763         __be32 *p, status;
1764
1765         memset(lcp, 0, sizeof(*lcp));
1766         if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
1767                 return nfserr_bad_xdr;
1768         if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
1769                 return nfserr_bad_xdr;
1770         if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
1771                 return nfserr_bad_xdr;
1772         status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
1773         if (status)
1774                 return status;
1775         if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
1776                 return nfserr_bad_xdr;
1777         if (lcp->lc_newoffset) {
1778                 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
1779                         return nfserr_bad_xdr;
1780         } else
1781                 lcp->lc_last_wr = 0;
1782         p = xdr_inline_decode(argp->xdr, XDR_UNIT);
1783         if (!p)
1784                 return nfserr_bad_xdr;
1785         if (xdr_item_is_present(p)) {
1786                 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
1787                 if (status)
1788                         return status;
1789         } else {
1790                 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1791         }
1792         return nfsd4_decode_layoutupdate4(argp, lcp);
1793 }
1794
1795 static __be32
1796 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1797                 union nfsd4_op_u *u)
1798 {
1799         struct nfsd4_layoutget *lgp = &u->layoutget;
1800         __be32 status;
1801
1802         memset(lgp, 0, sizeof(*lgp));
1803         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0)
1804                 return nfserr_bad_xdr;
1805         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0)
1806                 return nfserr_bad_xdr;
1807         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0)
1808                 return nfserr_bad_xdr;
1809         if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0)
1810                 return nfserr_bad_xdr;
1811         if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0)
1812                 return nfserr_bad_xdr;
1813         if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0)
1814                 return nfserr_bad_xdr;
1815         status = nfsd4_decode_stateid4(argp, &lgp->lg_sid);
1816         if (status)
1817                 return status;
1818         if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0)
1819                 return nfserr_bad_xdr;
1820
1821         return nfs_ok;
1822 }
1823
1824 static __be32
1825 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1826                 union nfsd4_op_u *u)
1827 {
1828         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1829         memset(lrp, 0, sizeof(*lrp));
1830         if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
1831                 return nfserr_bad_xdr;
1832         if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
1833                 return nfserr_bad_xdr;
1834         if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
1835                 return nfserr_bad_xdr;
1836         return nfsd4_decode_layoutreturn4(argp, lrp);
1837 }
1838 #endif /* CONFIG_NFSD_PNFS */
1839
1840 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1841                                            union nfsd4_op_u *u)
1842 {
1843         struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name;
1844         if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
1845                 return nfserr_bad_xdr;
1846
1847         sin->sin_exp = NULL;
1848         return nfs_ok;
1849 }
1850
1851 static __be32
1852 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1853                       union nfsd4_op_u *u)
1854 {
1855         struct nfsd4_sequence *seq = &u->sequence;
1856         __be32 *p, status;
1857
1858         status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
1859         if (status)
1860                 return status;
1861         p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
1862         if (!p)
1863                 return nfserr_bad_xdr;
1864         seq->seqid = be32_to_cpup(p++);
1865         seq->slotid = be32_to_cpup(p++);
1866         seq->maxslots = be32_to_cpup(p++);
1867         seq->cachethis = be32_to_cpup(p);
1868
1869         seq->status_flags = 0;
1870         return nfs_ok;
1871 }
1872
1873 static __be32
1874 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp,
1875                           union nfsd4_op_u *u)
1876 {
1877         struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
1878         struct nfsd4_test_stateid_id *stateid;
1879         __be32 status;
1880         u32 i;
1881
1882         memset(test_stateid, 0, sizeof(*test_stateid));
1883         if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
1884                 return nfserr_bad_xdr;
1885
1886         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1887         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1888                 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1889                 if (!stateid)
1890                         return nfserr_jukebox;
1891                 INIT_LIST_HEAD(&stateid->ts_id_list);
1892                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1893                 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
1894                 if (status)
1895                         return status;
1896         }
1897
1898         return nfs_ok;
1899 }
1900
1901 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
1902                                             union nfsd4_op_u *u)
1903 {
1904         struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
1905         return nfsd4_decode_clientid4(argp, &dc->clientid);
1906 }
1907
1908 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
1909                                             union nfsd4_op_u *u)
1910 {
1911         struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
1912         if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
1913                 return nfserr_bad_xdr;
1914         return nfs_ok;
1915 }
1916
1917 static __be32
1918 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1919                        union nfsd4_op_u *u)
1920 {
1921         struct nfsd4_fallocate *fallocate = &u->allocate;
1922         __be32 status;
1923
1924         status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
1925         if (status)
1926                 return status;
1927         if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
1928                 return nfserr_bad_xdr;
1929         if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
1930                 return nfserr_bad_xdr;
1931
1932         return nfs_ok;
1933 }
1934
1935 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1936                                       struct nl4_server *ns)
1937 {
1938         struct nfs42_netaddr *naddr;
1939         __be32 *p;
1940
1941         if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
1942                 return nfserr_bad_xdr;
1943
1944         /* currently support for 1 inter-server source server */
1945         switch (ns->nl4_type) {
1946         case NL4_NETADDR:
1947                 naddr = &ns->u.nl4_addr;
1948
1949                 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
1950                         return nfserr_bad_xdr;
1951                 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1952                         return nfserr_bad_xdr;
1953
1954                 p = xdr_inline_decode(argp->xdr, naddr->netid_len);
1955                 if (!p)
1956                         return nfserr_bad_xdr;
1957                 memcpy(naddr->netid, p, naddr->netid_len);
1958
1959                 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
1960                         return nfserr_bad_xdr;
1961                 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1962                         return nfserr_bad_xdr;
1963
1964                 p = xdr_inline_decode(argp->xdr, naddr->addr_len);
1965                 if (!p)
1966                         return nfserr_bad_xdr;
1967                 memcpy(naddr->addr, p, naddr->addr_len);
1968                 break;
1969         default:
1970                 return nfserr_bad_xdr;
1971         }
1972
1973         return nfs_ok;
1974 }
1975
1976 static __be32
1977 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1978 {
1979         struct nfsd4_copy *copy = &u->copy;
1980         u32 consecutive, i, count, sync;
1981         struct nl4_server *ns_dummy;
1982         __be32 status;
1983
1984         memset(copy, 0, sizeof(*copy));
1985         status = nfsd4_decode_stateid4(argp, &copy->cp_src_stateid);
1986         if (status)
1987                 return status;
1988         status = nfsd4_decode_stateid4(argp, &copy->cp_dst_stateid);
1989         if (status)
1990                 return status;
1991         if (xdr_stream_decode_u64(argp->xdr, &copy->cp_src_pos) < 0)
1992                 return nfserr_bad_xdr;
1993         if (xdr_stream_decode_u64(argp->xdr, &copy->cp_dst_pos) < 0)
1994                 return nfserr_bad_xdr;
1995         if (xdr_stream_decode_u64(argp->xdr, &copy->cp_count) < 0)
1996                 return nfserr_bad_xdr;
1997         /* ca_consecutive: we always do consecutive copies */
1998         if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
1999                 return nfserr_bad_xdr;
2000         if (xdr_stream_decode_bool(argp->xdr, &sync) < 0)
2001                 return nfserr_bad_xdr;
2002         nfsd4_copy_set_sync(copy, sync);
2003
2004         if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
2005                 return nfserr_bad_xdr;
2006         copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src));
2007         if (copy->cp_src == NULL)
2008                 return nfserr_jukebox;
2009         if (count == 0) { /* intra-server copy */
2010                 __set_bit(NFSD4_COPY_F_INTRA, &copy->cp_flags);
2011                 return nfs_ok;
2012         }
2013
2014         /* decode all the supplied server addresses but use only the first */
2015         status = nfsd4_decode_nl4_server(argp, copy->cp_src);
2016         if (status)
2017                 return status;
2018
2019         ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
2020         if (ns_dummy == NULL)
2021                 return nfserr_jukebox;
2022         for (i = 0; i < count - 1; i++) {
2023                 status = nfsd4_decode_nl4_server(argp, ns_dummy);
2024                 if (status) {
2025                         kfree(ns_dummy);
2026                         return status;
2027                 }
2028         }
2029         kfree(ns_dummy);
2030
2031         return nfs_ok;
2032 }
2033
2034 static __be32
2035 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
2036                          union nfsd4_op_u *u)
2037 {
2038         struct nfsd4_copy_notify *cn = &u->copy_notify;
2039         __be32 status;
2040
2041         memset(cn, 0, sizeof(*cn));
2042         cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src));
2043         if (cn->cpn_src == NULL)
2044                 return nfserr_jukebox;
2045         cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst));
2046         if (cn->cpn_dst == NULL)
2047                 return nfserr_jukebox;
2048
2049         status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
2050         if (status)
2051                 return status;
2052         return nfsd4_decode_nl4_server(argp, cn->cpn_dst);
2053 }
2054
2055 static __be32
2056 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
2057                             union nfsd4_op_u *u)
2058 {
2059         struct nfsd4_offload_status *os = &u->offload_status;
2060         os->count = 0;
2061         os->status = 0;
2062         return nfsd4_decode_stateid4(argp, &os->stateid);
2063 }
2064
2065 static __be32
2066 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2067 {
2068         struct nfsd4_seek *seek = &u->seek;
2069         __be32 status;
2070
2071         status = nfsd4_decode_stateid4(argp, &seek->seek_stateid);
2072         if (status)
2073                 return status;
2074         if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0)
2075                 return nfserr_bad_xdr;
2076         if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0)
2077                 return nfserr_bad_xdr;
2078
2079         seek->seek_eof = 0;
2080         seek->seek_pos = 0;
2081         return nfs_ok;
2082 }
2083
2084 static __be32
2085 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2086 {
2087         struct nfsd4_clone *clone = &u->clone;
2088         __be32 status;
2089
2090         status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid);
2091         if (status)
2092                 return status;
2093         status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid);
2094         if (status)
2095                 return status;
2096         if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0)
2097                 return nfserr_bad_xdr;
2098         if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0)
2099                 return nfserr_bad_xdr;
2100         if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0)
2101                 return nfserr_bad_xdr;
2102
2103         return nfs_ok;
2104 }
2105
2106 /*
2107  * XDR data that is more than PAGE_SIZE in size is normally part of a
2108  * read or write. However, the size of extended attributes is limited
2109  * by the maximum request size, and then further limited by the underlying
2110  * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2111  * is 64k). Since there is no kvec- or page-based interface to xattrs,
2112  * and we're not dealing with contiguous pages, we need to do some copying.
2113  */
2114
2115 /*
2116  * Decode data into buffer.
2117  */
2118 static __be32
2119 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2120                        char **bufp, u32 buflen)
2121 {
2122         struct page **pages = xdr->pages;
2123         struct kvec *head = xdr->head;
2124         char *tmp, *dp;
2125         u32 len;
2126
2127         if (buflen <= head->iov_len) {
2128                 /*
2129                  * We're in luck, the head has enough space. Just return
2130                  * the head, no need for copying.
2131                  */
2132                 *bufp = head->iov_base;
2133                 return 0;
2134         }
2135
2136         tmp = svcxdr_tmpalloc(argp, buflen);
2137         if (tmp == NULL)
2138                 return nfserr_jukebox;
2139
2140         dp = tmp;
2141         memcpy(dp, head->iov_base, head->iov_len);
2142         buflen -= head->iov_len;
2143         dp += head->iov_len;
2144
2145         while (buflen > 0) {
2146                 len = min_t(u32, buflen, PAGE_SIZE);
2147                 memcpy(dp, page_address(*pages), len);
2148
2149                 buflen -= len;
2150                 dp += len;
2151                 pages++;
2152         }
2153
2154         *bufp = tmp;
2155         return 0;
2156 }
2157
2158 /*
2159  * Get a user extended attribute name from the XDR buffer.
2160  * It will not have the "user." prefix, so prepend it.
2161  * Lastly, check for nul characters in the name.
2162  */
2163 static __be32
2164 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2165 {
2166         char *name, *sp, *dp;
2167         u32 namelen, cnt;
2168         __be32 *p;
2169
2170         if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0)
2171                 return nfserr_bad_xdr;
2172         if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2173                 return nfserr_nametoolong;
2174         if (namelen == 0)
2175                 return nfserr_bad_xdr;
2176         p = xdr_inline_decode(argp->xdr, namelen);
2177         if (!p)
2178                 return nfserr_bad_xdr;
2179         name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
2180         if (!name)
2181                 return nfserr_jukebox;
2182         memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2183
2184         /*
2185          * Copy the extended attribute name over while checking for 0
2186          * characters.
2187          */
2188         sp = (char *)p;
2189         dp = name + XATTR_USER_PREFIX_LEN;
2190         cnt = namelen;
2191
2192         while (cnt-- > 0) {
2193                 if (*sp == '\0')
2194                         return nfserr_bad_xdr;
2195                 *dp++ = *sp++;
2196         }
2197         *dp = '\0';
2198
2199         *namep = name;
2200
2201         return nfs_ok;
2202 }
2203
2204 /*
2205  * A GETXATTR op request comes without a length specifier. We just set the
2206  * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2207  * channel reply size. nfsd_getxattr will probe the length of the xattr,
2208  * check it against getxa_len, and allocate + return the value.
2209  */
2210 static __be32
2211 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
2212                       union nfsd4_op_u *u)
2213 {
2214         struct nfsd4_getxattr *getxattr = &u->getxattr;
2215         __be32 status;
2216         u32 maxcount;
2217
2218         memset(getxattr, 0, sizeof(*getxattr));
2219         status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
2220         if (status)
2221                 return status;
2222
2223         maxcount = svc_max_payload(argp->rqstp);
2224         maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2225
2226         getxattr->getxa_len = maxcount;
2227         return nfs_ok;
2228 }
2229
2230 static __be32
2231 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2232                       union nfsd4_op_u *u)
2233 {
2234         struct nfsd4_setxattr *setxattr = &u->setxattr;
2235         u32 flags, maxcount, size;
2236         __be32 status;
2237
2238         memset(setxattr, 0, sizeof(*setxattr));
2239
2240         if (xdr_stream_decode_u32(argp->xdr, &flags) < 0)
2241                 return nfserr_bad_xdr;
2242
2243         if (flags > SETXATTR4_REPLACE)
2244                 return nfserr_inval;
2245         setxattr->setxa_flags = flags;
2246
2247         status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2248         if (status)
2249                 return status;
2250
2251         maxcount = svc_max_payload(argp->rqstp);
2252         maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2253
2254         if (xdr_stream_decode_u32(argp->xdr, &size) < 0)
2255                 return nfserr_bad_xdr;
2256         if (size > maxcount)
2257                 return nfserr_xattr2big;
2258
2259         setxattr->setxa_len = size;
2260         if (size > 0) {
2261                 struct xdr_buf payload;
2262
2263                 if (!xdr_stream_subsegment(argp->xdr, &payload, size))
2264                         return nfserr_bad_xdr;
2265                 status = nfsd4_vbuf_from_vector(argp, &payload,
2266                                                 &setxattr->setxa_buf, size);
2267         }
2268
2269         return nfs_ok;
2270 }
2271
2272 static __be32
2273 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2274                         union nfsd4_op_u *u)
2275 {
2276         struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
2277         u32 maxcount;
2278
2279         memset(listxattrs, 0, sizeof(*listxattrs));
2280
2281         if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0)
2282                 return nfserr_bad_xdr;
2283
2284         /*
2285          * If the cookie  is too large to have even one user.x attribute
2286          * plus trailing '\0' left in a maximum size buffer, it's invalid.
2287          */
2288         if (listxattrs->lsxa_cookie >=
2289             (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2290                 return nfserr_badcookie;
2291
2292         if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0)
2293                 return nfserr_bad_xdr;
2294         if (maxcount < 8)
2295                 /* Always need at least 2 words (length and one character) */
2296                 return nfserr_inval;
2297
2298         maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2299         listxattrs->lsxa_maxcount = maxcount;
2300
2301         return nfs_ok;
2302 }
2303
2304 static __be32
2305 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2306                          union nfsd4_op_u *u)
2307 {
2308         struct nfsd4_removexattr *removexattr = &u->removexattr;
2309         memset(removexattr, 0, sizeof(*removexattr));
2310         return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2311 }
2312
2313 static __be32
2314 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2315 {
2316         return nfs_ok;
2317 }
2318
2319 static __be32
2320 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2321 {
2322         return nfserr_notsupp;
2323 }
2324
2325 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u);
2326
2327 static const nfsd4_dec nfsd4_dec_ops[] = {
2328         [OP_ACCESS]             = nfsd4_decode_access,
2329         [OP_CLOSE]              = nfsd4_decode_close,
2330         [OP_COMMIT]             = nfsd4_decode_commit,
2331         [OP_CREATE]             = nfsd4_decode_create,
2332         [OP_DELEGPURGE]         = nfsd4_decode_notsupp,
2333         [OP_DELEGRETURN]        = nfsd4_decode_delegreturn,
2334         [OP_GETATTR]            = nfsd4_decode_getattr,
2335         [OP_GETFH]              = nfsd4_decode_noop,
2336         [OP_LINK]               = nfsd4_decode_link,
2337         [OP_LOCK]               = nfsd4_decode_lock,
2338         [OP_LOCKT]              = nfsd4_decode_lockt,
2339         [OP_LOCKU]              = nfsd4_decode_locku,
2340         [OP_LOOKUP]             = nfsd4_decode_lookup,
2341         [OP_LOOKUPP]            = nfsd4_decode_noop,
2342         [OP_NVERIFY]            = nfsd4_decode_verify,
2343         [OP_OPEN]               = nfsd4_decode_open,
2344         [OP_OPENATTR]           = nfsd4_decode_notsupp,
2345         [OP_OPEN_CONFIRM]       = nfsd4_decode_open_confirm,
2346         [OP_OPEN_DOWNGRADE]     = nfsd4_decode_open_downgrade,
2347         [OP_PUTFH]              = nfsd4_decode_putfh,
2348         [OP_PUTPUBFH]           = nfsd4_decode_putpubfh,
2349         [OP_PUTROOTFH]          = nfsd4_decode_noop,
2350         [OP_READ]               = nfsd4_decode_read,
2351         [OP_READDIR]            = nfsd4_decode_readdir,
2352         [OP_READLINK]           = nfsd4_decode_noop,
2353         [OP_REMOVE]             = nfsd4_decode_remove,
2354         [OP_RENAME]             = nfsd4_decode_rename,
2355         [OP_RENEW]              = nfsd4_decode_renew,
2356         [OP_RESTOREFH]          = nfsd4_decode_noop,
2357         [OP_SAVEFH]             = nfsd4_decode_noop,
2358         [OP_SECINFO]            = nfsd4_decode_secinfo,
2359         [OP_SETATTR]            = nfsd4_decode_setattr,
2360         [OP_SETCLIENTID]        = nfsd4_decode_setclientid,
2361         [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm,
2362         [OP_VERIFY]             = nfsd4_decode_verify,
2363         [OP_WRITE]              = nfsd4_decode_write,
2364         [OP_RELEASE_LOCKOWNER]  = nfsd4_decode_release_lockowner,
2365
2366         /* new operations for NFSv4.1 */
2367         [OP_BACKCHANNEL_CTL]    = nfsd4_decode_backchannel_ctl,
2368         [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session,
2369         [OP_EXCHANGE_ID]        = nfsd4_decode_exchange_id,
2370         [OP_CREATE_SESSION]     = nfsd4_decode_create_session,
2371         [OP_DESTROY_SESSION]    = nfsd4_decode_destroy_session,
2372         [OP_FREE_STATEID]       = nfsd4_decode_free_stateid,
2373         [OP_GET_DIR_DELEGATION] = nfsd4_decode_notsupp,
2374 #ifdef CONFIG_NFSD_PNFS
2375         [OP_GETDEVICEINFO]      = nfsd4_decode_getdeviceinfo,
2376         [OP_GETDEVICELIST]      = nfsd4_decode_notsupp,
2377         [OP_LAYOUTCOMMIT]       = nfsd4_decode_layoutcommit,
2378         [OP_LAYOUTGET]          = nfsd4_decode_layoutget,
2379         [OP_LAYOUTRETURN]       = nfsd4_decode_layoutreturn,
2380 #else
2381         [OP_GETDEVICEINFO]      = nfsd4_decode_notsupp,
2382         [OP_GETDEVICELIST]      = nfsd4_decode_notsupp,
2383         [OP_LAYOUTCOMMIT]       = nfsd4_decode_notsupp,
2384         [OP_LAYOUTGET]          = nfsd4_decode_notsupp,
2385         [OP_LAYOUTRETURN]       = nfsd4_decode_notsupp,
2386 #endif
2387         [OP_SECINFO_NO_NAME]    = nfsd4_decode_secinfo_no_name,
2388         [OP_SEQUENCE]           = nfsd4_decode_sequence,
2389         [OP_SET_SSV]            = nfsd4_decode_notsupp,
2390         [OP_TEST_STATEID]       = nfsd4_decode_test_stateid,
2391         [OP_WANT_DELEGATION]    = nfsd4_decode_notsupp,
2392         [OP_DESTROY_CLIENTID]   = nfsd4_decode_destroy_clientid,
2393         [OP_RECLAIM_COMPLETE]   = nfsd4_decode_reclaim_complete,
2394
2395         /* new operations for NFSv4.2 */
2396         [OP_ALLOCATE]           = nfsd4_decode_fallocate,
2397         [OP_COPY]               = nfsd4_decode_copy,
2398         [OP_COPY_NOTIFY]        = nfsd4_decode_copy_notify,
2399         [OP_DEALLOCATE]         = nfsd4_decode_fallocate,
2400         [OP_IO_ADVISE]          = nfsd4_decode_notsupp,
2401         [OP_LAYOUTERROR]        = nfsd4_decode_notsupp,
2402         [OP_LAYOUTSTATS]        = nfsd4_decode_notsupp,
2403         [OP_OFFLOAD_CANCEL]     = nfsd4_decode_offload_status,
2404         [OP_OFFLOAD_STATUS]     = nfsd4_decode_offload_status,
2405         [OP_READ_PLUS]          = nfsd4_decode_read,
2406         [OP_SEEK]               = nfsd4_decode_seek,
2407         [OP_WRITE_SAME]         = nfsd4_decode_notsupp,
2408         [OP_CLONE]              = nfsd4_decode_clone,
2409         /* RFC 8276 extended atributes operations */
2410         [OP_GETXATTR]           = nfsd4_decode_getxattr,
2411         [OP_SETXATTR]           = nfsd4_decode_setxattr,
2412         [OP_LISTXATTRS]         = nfsd4_decode_listxattrs,
2413         [OP_REMOVEXATTR]        = nfsd4_decode_removexattr,
2414 };
2415
2416 static inline bool
2417 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2418 {
2419         if (op->opnum < FIRST_NFS4_OP)
2420                 return false;
2421         else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2422                 return false;
2423         else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2424                 return false;
2425         else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2426                 return false;
2427         return true;
2428 }
2429
2430 static bool
2431 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2432 {
2433         struct nfsd4_op *op;
2434         bool cachethis = false;
2435         int auth_slack= argp->rqstp->rq_auth_slack;
2436         int max_reply = auth_slack + 8; /* opcnt, status */
2437         int readcount = 0;
2438         int readbytes = 0;
2439         __be32 *p;
2440         int i;
2441
2442         if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
2443                 return false;
2444         max_reply += XDR_UNIT;
2445         argp->tag = NULL;
2446         if (unlikely(argp->taglen)) {
2447                 if (argp->taglen > NFSD4_MAX_TAGLEN)
2448                         return false;
2449                 p = xdr_inline_decode(argp->xdr, argp->taglen);
2450                 if (!p)
2451                         return false;
2452                 argp->tag = svcxdr_savemem(argp, p, argp->taglen);
2453                 if (!argp->tag)
2454                         return false;
2455                 max_reply += xdr_align_size(argp->taglen);
2456         }
2457
2458         if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
2459                 return false;
2460         if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
2461                 return false;
2462         argp->opcnt = min_t(u32, argp->client_opcnt,
2463                             NFSD_MAX_OPS_PER_COMPOUND);
2464
2465         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2466                 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));
2467                 if (!argp->ops) {
2468                         argp->ops = argp->iops;
2469                         return false;
2470                 }
2471         }
2472
2473         if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2474                 argp->opcnt = 0;
2475
2476         for (i = 0; i < argp->opcnt; i++) {
2477                 op = &argp->ops[i];
2478                 op->replay = NULL;
2479                 op->opdesc = NULL;
2480
2481                 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
2482                         return false;
2483                 if (nfsd4_opnum_in_range(argp, op)) {
2484                         op->opdesc = OPDESC(op);
2485                         op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2486                         if (op->status != nfs_ok)
2487                                 trace_nfsd_compound_decode_err(argp->rqstp,
2488                                                                argp->opcnt, i,
2489                                                                op->opnum,
2490                                                                op->status);
2491                 } else {
2492                         op->opnum = OP_ILLEGAL;
2493                         op->status = nfserr_op_illegal;
2494                 }
2495
2496                 /*
2497                  * We'll try to cache the result in the DRC if any one
2498                  * op in the compound wants to be cached:
2499                  */
2500                 cachethis |= nfsd4_cache_this_op(op);
2501
2502                 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2503                         readcount++;
2504                         readbytes += nfsd4_max_reply(argp->rqstp, op);
2505                 } else
2506                         max_reply += nfsd4_max_reply(argp->rqstp, op);
2507                 /*
2508                  * OP_LOCK and OP_LOCKT may return a conflicting lock.
2509                  * (Special case because it will just skip encoding this
2510                  * if it runs out of xdr buffer space, and it is the only
2511                  * operation that behaves this way.)
2512                  */
2513                 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2514                         max_reply += NFS4_OPAQUE_LIMIT;
2515
2516                 if (op->status) {
2517                         argp->opcnt = i+1;
2518                         break;
2519                 }
2520         }
2521         /* Sessions make the DRC unnecessary: */
2522         if (argp->minorversion)
2523                 cachethis = false;
2524         svc_reserve(argp->rqstp, max_reply + readbytes);
2525         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2526
2527         if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2528                 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
2529
2530         return true;
2531 }
2532
2533 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2534                              struct svc_export *exp)
2535 {
2536         if (exp->ex_flags & NFSEXP_V4ROOT) {
2537                 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2538                 *p++ = 0;
2539         } else
2540                 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2541         return p;
2542 }
2543
2544 static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr,
2545                                     struct timespec64 *tv)
2546 {
2547         __be32 *p;
2548
2549         p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2550         if (!p)
2551                 return nfserr_resource;
2552
2553         p = xdr_encode_hyper(p, (s64)tv->tv_sec);
2554         *p = cpu_to_be32(tv->tv_nsec);
2555         return nfs_ok;
2556 }
2557
2558 /*
2559  * ctime (in NFSv4, time_metadata) is not writeable, and the client
2560  * doesn't really care what resolution could theoretically be stored by
2561  * the filesystem.
2562  *
2563  * The client cares how close together changes can be while still
2564  * guaranteeing ctime changes.  For most filesystems (which have
2565  * timestamps with nanosecond fields) that is limited by the resolution
2566  * of the time returned from current_time() (which I'm assuming to be
2567  * 1/HZ).
2568  */
2569 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2570 {
2571         struct timespec64 ts;
2572         u32 ns;
2573
2574         ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2575         ts = ns_to_timespec64(ns);
2576
2577         p = xdr_encode_hyper(p, ts.tv_sec);
2578         *p++ = cpu_to_be32(ts.tv_nsec);
2579
2580         return p;
2581 }
2582
2583 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2584 {
2585         *p++ = cpu_to_be32(c->atomic);
2586         p = xdr_encode_hyper(p, c->before_change);
2587         p = xdr_encode_hyper(p, c->after_change);
2588         return p;
2589 }
2590
2591 /* Encode as an array of strings the string given with components
2592  * separated @sep, escaped with esc_enter and esc_exit.
2593  */
2594 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2595                                           char *components, char esc_enter,
2596                                           char esc_exit)
2597 {
2598         __be32 *p;
2599         __be32 pathlen;
2600         int pathlen_offset;
2601         int strlen, count=0;
2602         char *str, *end, *next;
2603
2604         dprintk("nfsd4_encode_components(%s)\n", components);
2605
2606         pathlen_offset = xdr->buf->len;
2607         p = xdr_reserve_space(xdr, 4);
2608         if (!p)
2609                 return nfserr_resource;
2610         p++; /* We will fill this in with @count later */
2611
2612         end = str = components;
2613         while (*end) {
2614                 bool found_esc = false;
2615
2616                 /* try to parse as esc_start, ..., esc_end, sep */
2617                 if (*str == esc_enter) {
2618                         for (; *end && (*end != esc_exit); end++)
2619                                 /* find esc_exit or end of string */;
2620                         next = end + 1;
2621                         if (*end && (!*next || *next == sep)) {
2622                                 str++;
2623                                 found_esc = true;
2624                         }
2625                 }
2626
2627                 if (!found_esc)
2628                         for (; *end && (*end != sep); end++)
2629                                 /* find sep or end of string */;
2630
2631                 strlen = end - str;
2632                 if (strlen) {
2633                         p = xdr_reserve_space(xdr, strlen + 4);
2634                         if (!p)
2635                                 return nfserr_resource;
2636                         p = xdr_encode_opaque(p, str, strlen);
2637                         count++;
2638                 }
2639                 else
2640                         end++;
2641                 if (found_esc)
2642                         end = next;
2643
2644                 str = end;
2645         }
2646         pathlen = htonl(count);
2647         write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2648         return 0;
2649 }
2650
2651 /* Encode as an array of strings the string given with components
2652  * separated @sep.
2653  */
2654 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2655                                       char *components)
2656 {
2657         return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2658 }
2659
2660 /*
2661  * encode a location element of a fs_locations structure
2662  */
2663 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2664                                         struct nfsd4_fs_location *location)
2665 {
2666         __be32 status;
2667
2668         status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2669                                                 '[', ']');
2670         if (status)
2671                 return status;
2672         status = nfsd4_encode_components(xdr, '/', location->path);
2673         if (status)
2674                 return status;
2675         return 0;
2676 }
2677
2678 /*
2679  * Encode a path in RFC3530 'pathname4' format
2680  */
2681 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2682                                 const struct path *root,
2683                                 const struct path *path)
2684 {
2685         struct path cur = *path;
2686         __be32 *p;
2687         struct dentry **components = NULL;
2688         unsigned int ncomponents = 0;
2689         __be32 err = nfserr_jukebox;
2690
2691         dprintk("nfsd4_encode_components(");
2692
2693         path_get(&cur);
2694         /* First walk the path up to the nfsd root, and store the
2695          * dentries/path components in an array.
2696          */
2697         for (;;) {
2698                 if (path_equal(&cur, root))
2699                         break;
2700                 if (cur.dentry == cur.mnt->mnt_root) {
2701                         if (follow_up(&cur))
2702                                 continue;
2703                         goto out_free;
2704                 }
2705                 if ((ncomponents & 15) == 0) {
2706                         struct dentry **new;
2707                         new = krealloc(components,
2708                                         sizeof(*new) * (ncomponents + 16),
2709                                         GFP_KERNEL);
2710                         if (!new)
2711                                 goto out_free;
2712                         components = new;
2713                 }
2714                 components[ncomponents++] = cur.dentry;
2715                 cur.dentry = dget_parent(cur.dentry);
2716         }
2717         err = nfserr_resource;
2718         p = xdr_reserve_space(xdr, 4);
2719         if (!p)
2720                 goto out_free;
2721         *p++ = cpu_to_be32(ncomponents);
2722
2723         while (ncomponents) {
2724                 struct dentry *dentry = components[ncomponents - 1];
2725                 unsigned int len;
2726
2727                 spin_lock(&dentry->d_lock);
2728                 len = dentry->d_name.len;
2729                 p = xdr_reserve_space(xdr, len + 4);
2730                 if (!p) {
2731                         spin_unlock(&dentry->d_lock);
2732                         goto out_free;
2733                 }
2734                 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2735                 dprintk("/%pd", dentry);
2736                 spin_unlock(&dentry->d_lock);
2737                 dput(dentry);
2738                 ncomponents--;
2739         }
2740
2741         err = 0;
2742 out_free:
2743         dprintk(")\n");
2744         while (ncomponents)
2745                 dput(components[--ncomponents]);
2746         kfree(components);
2747         path_put(&cur);
2748         return err;
2749 }
2750
2751 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2752                         struct svc_rqst *rqstp, const struct path *path)
2753 {
2754         struct svc_export *exp_ps;
2755         __be32 res;
2756
2757         exp_ps = rqst_find_fsidzero_export(rqstp);
2758         if (IS_ERR(exp_ps))
2759                 return nfserrno(PTR_ERR(exp_ps));
2760         res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2761         exp_put(exp_ps);
2762         return res;
2763 }
2764
2765 /*
2766  *  encode a fs_locations structure
2767  */
2768 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2769                         struct svc_rqst *rqstp, struct svc_export *exp)
2770 {
2771         __be32 status;
2772         int i;
2773         __be32 *p;
2774         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2775
2776         status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2777         if (status)
2778                 return status;
2779         p = xdr_reserve_space(xdr, 4);
2780         if (!p)
2781                 return nfserr_resource;
2782         *p++ = cpu_to_be32(fslocs->locations_count);
2783         for (i=0; i<fslocs->locations_count; i++) {
2784                 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2785                 if (status)
2786                         return status;
2787         }
2788         return 0;
2789 }
2790
2791 static u32 nfs4_file_type(umode_t mode)
2792 {
2793         switch (mode & S_IFMT) {
2794         case S_IFIFO:   return NF4FIFO;
2795         case S_IFCHR:   return NF4CHR;
2796         case S_IFDIR:   return NF4DIR;
2797         case S_IFBLK:   return NF4BLK;
2798         case S_IFLNK:   return NF4LNK;
2799         case S_IFREG:   return NF4REG;
2800         case S_IFSOCK:  return NF4SOCK;
2801         default:        return NF4BAD;
2802         }
2803 }
2804
2805 static inline __be32
2806 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2807                      struct nfs4_ace *ace)
2808 {
2809         if (ace->whotype != NFS4_ACL_WHO_NAMED)
2810                 return nfs4_acl_write_who(xdr, ace->whotype);
2811         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2812                 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2813         else
2814                 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2815 }
2816
2817 static inline __be32
2818 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2819 {
2820         __be32          *p;
2821         unsigned long   i = hweight_long(layout_types);
2822
2823         p = xdr_reserve_space(xdr, 4 + 4 * i);
2824         if (!p)
2825                 return nfserr_resource;
2826
2827         *p++ = cpu_to_be32(i);
2828
2829         for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2830                 if (layout_types & (1 << i))
2831                         *p++ = cpu_to_be32(i);
2832
2833         return 0;
2834 }
2835
2836 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2837                               FATTR4_WORD0_RDATTR_ERROR)
2838 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2839 #define WORD2_ABSENT_FS_ATTRS 0
2840
2841 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2842 static inline __be32
2843 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2844                             void *context, int len)
2845 {
2846         __be32 *p;
2847
2848         p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2849         if (!p)
2850                 return nfserr_resource;
2851
2852         /*
2853          * For now we use a 0 here to indicate the null translation; in
2854          * the future we may place a call to translation code here.
2855          */
2856         *p++ = cpu_to_be32(0); /* lfs */
2857         *p++ = cpu_to_be32(0); /* pi */
2858         p = xdr_encode_opaque(p, context, len);
2859         return 0;
2860 }
2861 #else
2862 static inline __be32
2863 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2864                             void *context, int len)
2865 { return 0; }
2866 #endif
2867
2868 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2869 {
2870         /* As per referral draft:  */
2871         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2872             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2873                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2874                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2875                         *rdattr_err = NFSERR_MOVED;
2876                 else
2877                         return nfserr_moved;
2878         }
2879         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2880         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2881         *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2882         return 0;
2883 }
2884
2885
2886 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2887 {
2888         struct path path = exp->ex_path;
2889         struct kstat stat;
2890         int err;
2891
2892         path_get(&path);
2893         while (follow_up(&path)) {
2894                 if (path.dentry != path.mnt->mnt_root)
2895                         break;
2896         }
2897         err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2898         path_put(&path);
2899         if (!err)
2900                 *pino = stat.ino;
2901         return err;
2902 }
2903
2904 static __be32
2905 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2906 {
2907         __be32 *p;
2908
2909         if (bmval2) {
2910                 p = xdr_reserve_space(xdr, 16);
2911                 if (!p)
2912                         goto out_resource;
2913                 *p++ = cpu_to_be32(3);
2914                 *p++ = cpu_to_be32(bmval0);
2915                 *p++ = cpu_to_be32(bmval1);
2916                 *p++ = cpu_to_be32(bmval2);
2917         } else if (bmval1) {
2918                 p = xdr_reserve_space(xdr, 12);
2919                 if (!p)
2920                         goto out_resource;
2921                 *p++ = cpu_to_be32(2);
2922                 *p++ = cpu_to_be32(bmval0);
2923                 *p++ = cpu_to_be32(bmval1);
2924         } else {
2925                 p = xdr_reserve_space(xdr, 8);
2926                 if (!p)
2927                         goto out_resource;
2928                 *p++ = cpu_to_be32(1);
2929                 *p++ = cpu_to_be32(bmval0);
2930         }
2931
2932         return 0;
2933 out_resource:
2934         return nfserr_resource;
2935 }
2936
2937 /*
2938  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2939  * ourselves.
2940  */
2941 static __be32
2942 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2943                 struct svc_export *exp,
2944                 struct dentry *dentry, u32 *bmval,
2945                 struct svc_rqst *rqstp, int ignore_crossmnt)
2946 {
2947         u32 bmval0 = bmval[0];
2948         u32 bmval1 = bmval[1];
2949         u32 bmval2 = bmval[2];
2950         struct kstat stat;
2951         struct svc_fh *tempfh = NULL;
2952         struct kstatfs statfs;
2953         __be32 *p, *attrlen_p;
2954         int starting_len = xdr->buf->len;
2955         int attrlen_offset;
2956         u32 dummy;
2957         u64 dummy64;
2958         u32 rdattr_err = 0;
2959         __be32 status;
2960         int err;
2961         struct nfs4_acl *acl = NULL;
2962 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2963         void *context = NULL;
2964         int contextlen;
2965 #endif
2966         bool contextsupport = false;
2967         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2968         u32 minorversion = resp->cstate.minorversion;
2969         struct path path = {
2970                 .mnt    = exp->ex_path.mnt,
2971                 .dentry = dentry,
2972         };
2973         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2974
2975         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2976         BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2977
2978         if (exp->ex_fslocs.migrated) {
2979                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2980                 if (status)
2981                         goto out;
2982         }
2983
2984         err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2985         if (err)
2986                 goto out_nfserr;
2987         if (!(stat.result_mask & STATX_BTIME))
2988                 /* underlying FS does not offer btime so we can't share it */
2989                 bmval1 &= ~FATTR4_WORD1_TIME_CREATE;
2990         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2991                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2992             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2993                        FATTR4_WORD1_SPACE_TOTAL))) {
2994                 err = vfs_statfs(&path, &statfs);
2995                 if (err)
2996                         goto out_nfserr;
2997         }
2998         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2999                 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
3000                 status = nfserr_jukebox;
3001                 if (!tempfh)
3002                         goto out;
3003                 fh_init(tempfh, NFS4_FHSIZE);
3004                 status = fh_compose(tempfh, exp, dentry, NULL);
3005                 if (status)
3006                         goto out;
3007                 fhp = tempfh;
3008         }
3009         if (bmval0 & FATTR4_WORD0_ACL) {
3010                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
3011                 if (err == -EOPNOTSUPP)
3012                         bmval0 &= ~FATTR4_WORD0_ACL;
3013                 else if (err == -EINVAL) {
3014                         status = nfserr_attrnotsupp;
3015                         goto out;
3016                 } else if (err != 0)
3017                         goto out_nfserr;
3018         }
3019
3020 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3021         if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
3022              bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
3023                 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3024                         err = security_inode_getsecctx(d_inode(dentry),
3025                                                 &context, &contextlen);
3026                 else
3027                         err = -EOPNOTSUPP;
3028                 contextsupport = (err == 0);
3029                 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3030                         if (err == -EOPNOTSUPP)
3031                                 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
3032                         else if (err)
3033                                 goto out_nfserr;
3034                 }
3035         }
3036 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3037
3038         status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
3039         if (status)
3040                 goto out;
3041
3042         attrlen_offset = xdr->buf->len;
3043         attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3044         if (!attrlen_p)
3045                 goto out_resource;
3046
3047         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
3048                 u32 supp[3];
3049
3050                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3051
3052                 if (!IS_POSIXACL(dentry->d_inode))
3053                         supp[0] &= ~FATTR4_WORD0_ACL;
3054                 if (!contextsupport)
3055                         supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3056                 if (!supp[2]) {
3057                         p = xdr_reserve_space(xdr, 12);
3058                         if (!p)
3059                                 goto out_resource;
3060                         *p++ = cpu_to_be32(2);
3061                         *p++ = cpu_to_be32(supp[0]);
3062                         *p++ = cpu_to_be32(supp[1]);
3063                 } else {
3064                         p = xdr_reserve_space(xdr, 16);
3065                         if (!p)
3066                                 goto out_resource;
3067                         *p++ = cpu_to_be32(3);
3068                         *p++ = cpu_to_be32(supp[0]);
3069                         *p++ = cpu_to_be32(supp[1]);
3070                         *p++ = cpu_to_be32(supp[2]);
3071                 }
3072         }
3073         if (bmval0 & FATTR4_WORD0_TYPE) {
3074                 p = xdr_reserve_space(xdr, 4);
3075                 if (!p)
3076                         goto out_resource;
3077                 dummy = nfs4_file_type(stat.mode);
3078                 if (dummy == NF4BAD) {
3079                         status = nfserr_serverfault;
3080                         goto out;
3081                 }
3082                 *p++ = cpu_to_be32(dummy);
3083         }
3084         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
3085                 p = xdr_reserve_space(xdr, 4);
3086                 if (!p)
3087                         goto out_resource;
3088                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
3089                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
3090                 else
3091                         *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
3092                                                 NFS4_FH_VOL_RENAME);
3093         }
3094         if (bmval0 & FATTR4_WORD0_CHANGE) {
3095                 p = xdr_reserve_space(xdr, 8);
3096                 if (!p)
3097                         goto out_resource;
3098                 p = encode_change(p, &stat, d_inode(dentry), exp);
3099         }
3100         if (bmval0 & FATTR4_WORD0_SIZE) {
3101                 p = xdr_reserve_space(xdr, 8);
3102                 if (!p)
3103                         goto out_resource;
3104                 p = xdr_encode_hyper(p, stat.size);
3105         }
3106         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
3107                 p = xdr_reserve_space(xdr, 4);
3108                 if (!p)
3109                         goto out_resource;
3110                 *p++ = cpu_to_be32(1);
3111         }
3112         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
3113                 p = xdr_reserve_space(xdr, 4);
3114                 if (!p)
3115                         goto out_resource;
3116                 *p++ = cpu_to_be32(1);
3117         }
3118         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
3119                 p = xdr_reserve_space(xdr, 4);
3120                 if (!p)
3121                         goto out_resource;
3122                 *p++ = cpu_to_be32(0);
3123         }
3124         if (bmval0 & FATTR4_WORD0_FSID) {
3125                 p = xdr_reserve_space(xdr, 16);
3126                 if (!p)
3127                         goto out_resource;
3128                 if (exp->ex_fslocs.migrated) {
3129                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3130                         p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3131                 } else switch(fsid_source(fhp)) {
3132                 case FSIDSOURCE_FSID:
3133                         p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
3134                         p = xdr_encode_hyper(p, (u64)0);
3135                         break;
3136                 case FSIDSOURCE_DEV:
3137                         *p++ = cpu_to_be32(0);
3138                         *p++ = cpu_to_be32(MAJOR(stat.dev));
3139                         *p++ = cpu_to_be32(0);
3140                         *p++ = cpu_to_be32(MINOR(stat.dev));
3141                         break;
3142                 case FSIDSOURCE_UUID:
3143                         p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
3144                                                                 EX_UUID_LEN);
3145                         break;
3146                 }
3147         }
3148         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
3149                 p = xdr_reserve_space(xdr, 4);
3150                 if (!p)
3151                         goto out_resource;
3152                 *p++ = cpu_to_be32(0);
3153         }
3154         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
3155                 p = xdr_reserve_space(xdr, 4);
3156                 if (!p)
3157                         goto out_resource;
3158                 *p++ = cpu_to_be32(nn->nfsd4_lease);
3159         }
3160         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
3161                 p = xdr_reserve_space(xdr, 4);
3162                 if (!p)
3163                         goto out_resource;
3164                 *p++ = cpu_to_be32(rdattr_err);
3165         }
3166         if (bmval0 & FATTR4_WORD0_ACL) {
3167                 struct nfs4_ace *ace;
3168
3169                 if (acl == NULL) {
3170                         p = xdr_reserve_space(xdr, 4);
3171                         if (!p)
3172                                 goto out_resource;
3173
3174                         *p++ = cpu_to_be32(0);
3175                         goto out_acl;
3176                 }
3177                 p = xdr_reserve_space(xdr, 4);
3178                 if (!p)
3179                         goto out_resource;
3180                 *p++ = cpu_to_be32(acl->naces);
3181
3182                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3183                         p = xdr_reserve_space(xdr, 4*3);
3184                         if (!p)
3185                                 goto out_resource;
3186                         *p++ = cpu_to_be32(ace->type);
3187                         *p++ = cpu_to_be32(ace->flag);
3188                         *p++ = cpu_to_be32(ace->access_mask &
3189                                                         NFS4_ACE_MASK_ALL);
3190                         status = nfsd4_encode_aclname(xdr, rqstp, ace);
3191                         if (status)
3192                                 goto out;
3193                 }
3194         }
3195 out_acl:
3196         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
3197                 p = xdr_reserve_space(xdr, 4);
3198                 if (!p)
3199                         goto out_resource;
3200                 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
3201                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
3202         }
3203         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
3204                 p = xdr_reserve_space(xdr, 4);
3205                 if (!p)
3206                         goto out_resource;
3207                 *p++ = cpu_to_be32(1);
3208         }
3209         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
3210                 p = xdr_reserve_space(xdr, 4);
3211                 if (!p)
3212                         goto out_resource;
3213                 *p++ = cpu_to_be32(0);
3214         }
3215         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
3216                 p = xdr_reserve_space(xdr, 4);
3217                 if (!p)
3218                         goto out_resource;
3219                 *p++ = cpu_to_be32(1);
3220         }
3221         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
3222                 p = xdr_reserve_space(xdr, 4);
3223                 if (!p)
3224                         goto out_resource;
3225                 *p++ = cpu_to_be32(1);
3226         }
3227         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
3228                 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
3229                 if (!p)
3230                         goto out_resource;
3231                 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw,
3232                                         fhp->fh_handle.fh_size);
3233         }
3234         if (bmval0 & FATTR4_WORD0_FILEID) {
3235                 p = xdr_reserve_space(xdr, 8);
3236                 if (!p)
3237                         goto out_resource;
3238                 p = xdr_encode_hyper(p, stat.ino);
3239         }
3240         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
3241                 p = xdr_reserve_space(xdr, 8);
3242                 if (!p)
3243                         goto out_resource;
3244                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3245         }
3246         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
3247                 p = xdr_reserve_space(xdr, 8);
3248                 if (!p)
3249                         goto out_resource;
3250                 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3251         }
3252         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
3253                 p = xdr_reserve_space(xdr, 8);
3254                 if (!p)
3255                         goto out_resource;
3256                 p = xdr_encode_hyper(p, (u64) statfs.f_files);
3257         }
3258         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
3259                 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
3260                 if (status)
3261                         goto out;
3262         }
3263         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
3264                 p = xdr_reserve_space(xdr, 4);
3265                 if (!p)
3266                         goto out_resource;
3267                 *p++ = cpu_to_be32(1);
3268         }
3269         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
3270                 p = xdr_reserve_space(xdr, 8);
3271                 if (!p)
3272                         goto out_resource;
3273                 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
3274         }
3275         if (bmval0 & FATTR4_WORD0_MAXLINK) {
3276                 p = xdr_reserve_space(xdr, 4);
3277                 if (!p)
3278                         goto out_resource;
3279                 *p++ = cpu_to_be32(255);
3280         }
3281         if (bmval0 & FATTR4_WORD0_MAXNAME) {
3282                 p = xdr_reserve_space(xdr, 4);
3283                 if (!p)
3284                         goto out_resource;
3285                 *p++ = cpu_to_be32(statfs.f_namelen);
3286         }
3287         if (bmval0 & FATTR4_WORD0_MAXREAD) {
3288                 p = xdr_reserve_space(xdr, 8);
3289                 if (!p)
3290                         goto out_resource;
3291                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3292         }
3293         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
3294                 p = xdr_reserve_space(xdr, 8);
3295                 if (!p)
3296                         goto out_resource;
3297                 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3298         }
3299         if (bmval1 & FATTR4_WORD1_MODE) {
3300                 p = xdr_reserve_space(xdr, 4);
3301                 if (!p)
3302                         goto out_resource;
3303                 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
3304         }
3305         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
3306                 p = xdr_reserve_space(xdr, 4);
3307                 if (!p)
3308                         goto out_resource;
3309                 *p++ = cpu_to_be32(1);
3310         }
3311         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
3312                 p = xdr_reserve_space(xdr, 4);
3313                 if (!p)
3314                         goto out_resource;
3315                 *p++ = cpu_to_be32(stat.nlink);
3316         }
3317         if (bmval1 & FATTR4_WORD1_OWNER) {
3318                 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
3319                 if (status)
3320                         goto out;
3321         }
3322         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
3323                 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
3324                 if (status)
3325                         goto out;
3326         }
3327         if (bmval1 & FATTR4_WORD1_RAWDEV) {
3328                 p = xdr_reserve_space(xdr, 8);
3329                 if (!p)
3330                         goto out_resource;
3331                 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
3332                 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
3333         }
3334         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
3335                 p = xdr_reserve_space(xdr, 8);
3336                 if (!p)
3337                         goto out_resource;
3338                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
3339                 p = xdr_encode_hyper(p, dummy64);
3340         }
3341         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
3342                 p = xdr_reserve_space(xdr, 8);
3343                 if (!p)
3344                         goto out_resource;
3345                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
3346                 p = xdr_encode_hyper(p, dummy64);
3347         }
3348         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
3349                 p = xdr_reserve_space(xdr, 8);
3350                 if (!p)
3351                         goto out_resource;
3352                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
3353                 p = xdr_encode_hyper(p, dummy64);
3354         }
3355         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
3356                 p = xdr_reserve_space(xdr, 8);
3357                 if (!p)
3358                         goto out_resource;
3359                 dummy64 = (u64)stat.blocks << 9;
3360                 p = xdr_encode_hyper(p, dummy64);
3361         }
3362         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
3363                 status = nfsd4_encode_nfstime4(xdr, &stat.atime);
3364                 if (status)
3365                         goto out;
3366         }
3367         if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
3368                 status = nfsd4_encode_nfstime4(xdr, &stat.btime);
3369                 if (status)
3370                         goto out;
3371         }
3372         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
3373                 p = xdr_reserve_space(xdr, 12);
3374                 if (!p)
3375                         goto out_resource;
3376                 p = encode_time_delta(p, d_inode(dentry));
3377         }
3378         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
3379                 status = nfsd4_encode_nfstime4(xdr, &stat.ctime);
3380                 if (status)
3381                         goto out;
3382         }
3383         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
3384                 status = nfsd4_encode_nfstime4(xdr, &stat.mtime);
3385                 if (status)
3386                         goto out;
3387         }
3388         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
3389                 u64 ino = stat.ino;
3390
3391                 p = xdr_reserve_space(xdr, 8);
3392                 if (!p)
3393                         goto out_resource;
3394                 /*
3395                  * Get ino of mountpoint in parent filesystem, if not ignoring
3396                  * crossmount and this is the root of a cross-mounted
3397                  * filesystem.
3398                  */
3399                 if (ignore_crossmnt == 0 &&
3400                     dentry == exp->ex_path.mnt->mnt_root) {
3401                         err = nfsd4_get_mounted_on_ino(exp, &ino);
3402                         if (err)
3403                                 goto out_nfserr;
3404                 }
3405                 p = xdr_encode_hyper(p, ino);
3406         }
3407 #ifdef CONFIG_NFSD_PNFS
3408         if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
3409                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3410                 if (status)
3411                         goto out;
3412         }
3413
3414         if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
3415                 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3416                 if (status)
3417                         goto out;
3418         }
3419
3420         if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
3421                 p = xdr_reserve_space(xdr, 4);
3422                 if (!p)
3423                         goto out_resource;
3424                 *p++ = cpu_to_be32(stat.blksize);
3425         }
3426 #endif /* CONFIG_NFSD_PNFS */
3427         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
3428                 u32 supp[3];
3429
3430                 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3431                 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3432                 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3433                 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3434
3435                 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
3436                 if (status)
3437                         goto out;
3438         }
3439
3440 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3441         if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3442                 status = nfsd4_encode_security_label(xdr, rqstp, context,
3443                                                                 contextlen);
3444                 if (status)
3445                         goto out;
3446         }
3447 #endif
3448
3449         if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
3450                 p = xdr_reserve_space(xdr, 4);
3451                 if (!p)
3452                         goto out_resource;
3453                 err = xattr_supported_namespace(d_inode(dentry),
3454                                                 XATTR_USER_PREFIX);
3455                 *p++ = cpu_to_be32(err == 0);
3456         }
3457
3458         *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3459         status = nfs_ok;
3460
3461 out:
3462 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3463         if (context)
3464                 security_release_secctx(context, contextlen);
3465 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3466         kfree(acl);
3467         if (tempfh) {
3468                 fh_put(tempfh);
3469                 kfree(tempfh);
3470         }
3471         if (status)
3472                 xdr_truncate_encode(xdr, starting_len);
3473         return status;
3474 out_nfserr:
3475         status = nfserrno(err);
3476         goto out;
3477 out_resource:
3478         status = nfserr_resource;
3479         goto out;
3480 }
3481
3482 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3483                                 struct xdr_buf *buf, __be32 *p, int bytes)
3484 {
3485         xdr->scratch.iov_len = 0;
3486         memset(buf, 0, sizeof(struct xdr_buf));
3487         buf->head[0].iov_base = p;
3488         buf->head[0].iov_len = 0;
3489         buf->len = 0;
3490         xdr->buf = buf;
3491         xdr->iov = buf->head;
3492         xdr->p = p;
3493         xdr->end = (void *)p + bytes;
3494         buf->buflen = bytes;
3495 }
3496
3497 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3498                         struct svc_fh *fhp, struct svc_export *exp,
3499                         struct dentry *dentry, u32 *bmval,
3500                         struct svc_rqst *rqstp, int ignore_crossmnt)
3501 {
3502         struct xdr_buf dummy;
3503         struct xdr_stream xdr;
3504         __be32 ret;
3505
3506         svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3507         ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3508                                                         ignore_crossmnt);
3509         *p = xdr.p;
3510         return ret;
3511 }
3512
3513 static inline int attributes_need_mount(u32 *bmval)
3514 {
3515         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3516                 return 1;
3517         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3518                 return 1;
3519         return 0;
3520 }
3521
3522 static __be32
3523 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3524                         const char *name, int namlen)
3525 {
3526         struct svc_export *exp = cd->rd_fhp->fh_export;
3527         struct dentry *dentry;
3528         __be32 nfserr;
3529         int ignore_crossmnt = 0;
3530
3531         dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3532         if (IS_ERR(dentry))
3533                 return nfserrno(PTR_ERR(dentry));
3534
3535         exp_get(exp);
3536         /*
3537          * In the case of a mountpoint, the client may be asking for
3538          * attributes that are only properties of the underlying filesystem
3539          * as opposed to the cross-mounted file system. In such a case,
3540          * we will not follow the cross mount and will fill the attribtutes
3541          * directly from the mountpoint dentry.
3542          */
3543         if (nfsd_mountpoint(dentry, exp)) {
3544                 int err;
3545
3546                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3547                                 && !attributes_need_mount(cd->rd_bmval)) {
3548                         ignore_crossmnt = 1;
3549                         goto out_encode;
3550                 }
3551                 /*
3552                  * Why the heck aren't we just using nfsd_lookup??
3553                  * Different "."/".." handling?  Something else?
3554                  * At least, add a comment here to explain....
3555                  */
3556                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3557                 if (err) {
3558                         nfserr = nfserrno(err);
3559                         goto out_put;
3560                 }
3561                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3562                 if (nfserr)
3563                         goto out_put;
3564
3565         }
3566 out_encode:
3567         nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3568                                         cd->rd_rqstp, ignore_crossmnt);
3569 out_put:
3570         dput(dentry);
3571         exp_put(exp);
3572         return nfserr;
3573 }
3574
3575 static __be32 *
3576 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3577 {
3578         __be32 *p;
3579
3580         p = xdr_reserve_space(xdr, 20);
3581         if (!p)
3582                 return NULL;
3583         *p++ = htonl(2);
3584         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3585         *p++ = htonl(0);                         /* bmval1 */
3586
3587         *p++ = htonl(4);     /* attribute length */
3588         *p++ = nfserr;       /* no htonl */
3589         return p;
3590 }
3591
3592 static int
3593 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3594                     loff_t offset, u64 ino, unsigned int d_type)
3595 {
3596         struct readdir_cd *ccd = ccdv;
3597         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3598         struct xdr_stream *xdr = cd->xdr;
3599         int start_offset = xdr->buf->len;
3600         int cookie_offset;
3601         u32 name_and_cookie;
3602         int entry_bytes;
3603         __be32 nfserr = nfserr_toosmall;
3604         __be64 wire_offset;
3605         __be32 *p;
3606
3607         /* In nfsv4, "." and ".." never make it onto the wire.. */
3608         if (name && isdotent(name, namlen)) {
3609                 cd->common.err = nfs_ok;
3610                 return 0;
3611         }
3612
3613         if (cd->cookie_offset) {
3614                 wire_offset = cpu_to_be64(offset);
3615                 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3616                                                         &wire_offset, 8);
3617         }
3618
3619         p = xdr_reserve_space(xdr, 4);
3620         if (!p)
3621                 goto fail;
3622         *p++ = xdr_one;                             /* mark entry present */
3623         cookie_offset = xdr->buf->len;
3624         p = xdr_reserve_space(xdr, 3*4 + namlen);
3625         if (!p)
3626                 goto fail;
3627         p = xdr_encode_hyper(p, OFFSET_MAX);        /* offset of next entry */
3628         p = xdr_encode_array(p, name, namlen);      /* name length & name */
3629
3630         nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3631         switch (nfserr) {
3632         case nfs_ok:
3633                 break;
3634         case nfserr_resource:
3635                 nfserr = nfserr_toosmall;
3636                 goto fail;
3637         case nfserr_noent:
3638                 xdr_truncate_encode(xdr, start_offset);
3639                 goto skip_entry;
3640         case nfserr_jukebox:
3641                 /*
3642                  * The pseudoroot should only display dentries that lead to
3643                  * exports. If we get EJUKEBOX here, then we can't tell whether
3644                  * this entry should be included. Just fail the whole READDIR
3645                  * with NFS4ERR_DELAY in that case, and hope that the situation
3646                  * will resolve itself by the client's next attempt.
3647                  */
3648                 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3649                         goto fail;
3650                 fallthrough;
3651         default:
3652                 /*
3653                  * If the client requested the RDATTR_ERROR attribute,
3654                  * we stuff the error code into this attribute
3655                  * and continue.  If this attribute was not requested,
3656                  * then in accordance with the spec, we fail the
3657                  * entire READDIR operation(!)
3658                  */
3659                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3660                         goto fail;
3661                 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3662                 if (p == NULL) {
3663                         nfserr = nfserr_toosmall;
3664                         goto fail;
3665                 }
3666         }
3667         nfserr = nfserr_toosmall;
3668         entry_bytes = xdr->buf->len - start_offset;
3669         if (entry_bytes > cd->rd_maxcount)
3670                 goto fail;
3671         cd->rd_maxcount -= entry_bytes;
3672         /*
3673          * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3674          * notes that it could be zero. If it is zero, then the server
3675          * should enforce only the rd_maxcount value.
3676          */
3677         if (cd->rd_dircount) {
3678                 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3679                 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3680                         goto fail;
3681                 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3682                 if (!cd->rd_dircount)
3683                         cd->rd_maxcount = 0;
3684         }
3685
3686         cd->cookie_offset = cookie_offset;
3687 skip_entry:
3688         cd->common.err = nfs_ok;
3689         return 0;
3690 fail:
3691         xdr_truncate_encode(xdr, start_offset);
3692         cd->common.err = nfserr;
3693         return -EINVAL;
3694 }
3695
3696 static __be32
3697 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3698 {
3699         __be32 *p;
3700
3701         p = xdr_reserve_space(xdr, sizeof(stateid_t));
3702         if (!p)
3703                 return nfserr_resource;
3704         *p++ = cpu_to_be32(sid->si_generation);
3705         p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3706                                         sizeof(stateid_opaque_t));
3707         return 0;
3708 }
3709
3710 static __be32
3711 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3712                     union nfsd4_op_u *u)
3713 {
3714         struct nfsd4_access *access = &u->access;
3715         struct xdr_stream *xdr = resp->xdr;
3716         __be32 *p;
3717
3718         p = xdr_reserve_space(xdr, 8);
3719         if (!p)
3720                 return nfserr_resource;
3721         *p++ = cpu_to_be32(access->ac_supported);
3722         *p++ = cpu_to_be32(access->ac_resp_access);
3723         return 0;
3724 }
3725
3726 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3727                                                 union nfsd4_op_u *u)
3728 {
3729         struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3730         struct xdr_stream *xdr = resp->xdr;
3731         __be32 *p;
3732
3733         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3734         if (!p)
3735                 return nfserr_resource;
3736         p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3737                                         NFS4_MAX_SESSIONID_LEN);
3738         *p++ = cpu_to_be32(bcts->dir);
3739         /* Upshifting from TCP to RDMA is not supported */
3740         *p++ = cpu_to_be32(0);
3741         return 0;
3742 }
3743
3744 static __be32
3745 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3746                    union nfsd4_op_u *u)
3747 {
3748         struct nfsd4_close *close = &u->close;
3749         struct xdr_stream *xdr = resp->xdr;
3750
3751         return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3752 }
3753
3754
3755 static __be32
3756 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3757                     union nfsd4_op_u *u)
3758 {
3759         struct nfsd4_commit *commit = &u->commit;
3760         struct xdr_stream *xdr = resp->xdr;
3761         __be32 *p;
3762
3763         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3764         if (!p)
3765                 return nfserr_resource;
3766         p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3767                                                 NFS4_VERIFIER_SIZE);
3768         return 0;
3769 }
3770
3771 static __be32
3772 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
3773                     union nfsd4_op_u *u)
3774 {
3775         struct nfsd4_create *create = &u->create;
3776         struct xdr_stream *xdr = resp->xdr;
3777         __be32 *p;
3778
3779         p = xdr_reserve_space(xdr, 20);
3780         if (!p)
3781                 return nfserr_resource;
3782         encode_cinfo(p, &create->cr_cinfo);
3783         return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3784                         create->cr_bmval[1], create->cr_bmval[2]);
3785 }
3786
3787 static __be32
3788 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
3789                      union nfsd4_op_u *u)
3790 {
3791         struct nfsd4_getattr *getattr = &u->getattr;
3792         struct svc_fh *fhp = getattr->ga_fhp;
3793         struct xdr_stream *xdr = resp->xdr;
3794
3795         return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3796                                     getattr->ga_bmval, resp->rqstp, 0);
3797 }
3798
3799 static __be32
3800 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
3801                    union nfsd4_op_u *u)
3802 {
3803         struct svc_fh **fhpp = &u->getfh;
3804         struct xdr_stream *xdr = resp->xdr;
3805         struct svc_fh *fhp = *fhpp;
3806         unsigned int len;
3807         __be32 *p;
3808
3809         len = fhp->fh_handle.fh_size;
3810         p = xdr_reserve_space(xdr, len + 4);
3811         if (!p)
3812                 return nfserr_resource;
3813         p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len);
3814         return 0;
3815 }
3816
3817 /*
3818 * Including all fields other than the name, a LOCK4denied structure requires
3819 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3820 */
3821 static __be32
3822 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3823 {
3824         struct xdr_netobj *conf = &ld->ld_owner;
3825         __be32 *p;
3826
3827 again:
3828         p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3829         if (!p) {
3830                 /*
3831                  * Don't fail to return the result just because we can't
3832                  * return the conflicting open:
3833                  */
3834                 if (conf->len) {
3835                         kfree(conf->data);
3836                         conf->len = 0;
3837                         conf->data = NULL;
3838                         goto again;
3839                 }
3840                 return nfserr_resource;
3841         }
3842         p = xdr_encode_hyper(p, ld->ld_start);
3843         p = xdr_encode_hyper(p, ld->ld_length);
3844         *p++ = cpu_to_be32(ld->ld_type);
3845         if (conf->len) {
3846                 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3847                 p = xdr_encode_opaque(p, conf->data, conf->len);
3848                 kfree(conf->data);
3849         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
3850                 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3851                 *p++ = cpu_to_be32(0); /* length of owner name */
3852         }
3853         return nfserr_denied;
3854 }
3855
3856 static __be32
3857 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
3858                   union nfsd4_op_u *u)
3859 {
3860         struct nfsd4_lock *lock = &u->lock;
3861         struct xdr_stream *xdr = resp->xdr;
3862
3863         if (!nfserr)
3864                 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3865         else if (nfserr == nfserr_denied)
3866                 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3867
3868         return nfserr;
3869 }
3870
3871 static __be32
3872 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
3873                    union nfsd4_op_u *u)
3874 {
3875         struct nfsd4_lockt *lockt = &u->lockt;
3876         struct xdr_stream *xdr = resp->xdr;
3877
3878         if (nfserr == nfserr_denied)
3879                 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3880         return nfserr;
3881 }
3882
3883 static __be32
3884 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
3885                    union nfsd4_op_u *u)
3886 {
3887         struct nfsd4_locku *locku = &u->locku;
3888         struct xdr_stream *xdr = resp->xdr;
3889
3890         return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3891 }
3892
3893
3894 static __be32
3895 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
3896                   union nfsd4_op_u *u)
3897 {
3898         struct nfsd4_link *link = &u->link;
3899         struct xdr_stream *xdr = resp->xdr;
3900         __be32 *p;
3901
3902         p = xdr_reserve_space(xdr, 20);
3903         if (!p)
3904                 return nfserr_resource;
3905         p = encode_cinfo(p, &link->li_cinfo);
3906         return 0;
3907 }
3908
3909
3910 static __be32
3911 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
3912                   union nfsd4_op_u *u)
3913 {
3914         struct nfsd4_open *open = &u->open;
3915         struct xdr_stream *xdr = resp->xdr;
3916         __be32 *p;
3917
3918         nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3919         if (nfserr)
3920                 return nfserr;
3921         p = xdr_reserve_space(xdr, 24);
3922         if (!p)
3923                 return nfserr_resource;
3924         p = encode_cinfo(p, &open->op_cinfo);
3925         *p++ = cpu_to_be32(open->op_rflags);
3926
3927         nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3928                                         open->op_bmval[2]);
3929         if (nfserr)
3930                 return nfserr;
3931
3932         p = xdr_reserve_space(xdr, 4);
3933         if (!p)
3934                 return nfserr_resource;
3935
3936         *p++ = cpu_to_be32(open->op_delegate_type);
3937         switch (open->op_delegate_type) {
3938         case NFS4_OPEN_DELEGATE_NONE:
3939                 break;
3940         case NFS4_OPEN_DELEGATE_READ:
3941                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3942                 if (nfserr)
3943                         return nfserr;
3944                 p = xdr_reserve_space(xdr, 20);
3945                 if (!p)
3946                         return nfserr_resource;
3947                 *p++ = cpu_to_be32(open->op_recall);
3948
3949                 /*
3950                  * TODO: ACE's in delegations
3951                  */
3952                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3953                 *p++ = cpu_to_be32(0);
3954                 *p++ = cpu_to_be32(0);
3955                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3956                 break;
3957         case NFS4_OPEN_DELEGATE_WRITE:
3958                 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3959                 if (nfserr)
3960                         return nfserr;
3961                 p = xdr_reserve_space(xdr, 32);
3962                 if (!p)
3963                         return nfserr_resource;
3964                 *p++ = cpu_to_be32(open->op_recall);
3965
3966                 /*
3967                  * TODO: space_limit's in delegations
3968                  */
3969                 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3970                 *p++ = cpu_to_be32(~(u32)0);
3971                 *p++ = cpu_to_be32(~(u32)0);
3972
3973                 /*
3974                  * TODO: ACE's in delegations
3975                  */
3976                 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3977                 *p++ = cpu_to_be32(0);
3978                 *p++ = cpu_to_be32(0);
3979                 *p++ = cpu_to_be32(0);   /* XXX: is NULL principal ok? */
3980                 break;
3981         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3982                 switch (open->op_why_no_deleg) {
3983                 case WND4_CONTENTION:
3984                 case WND4_RESOURCE:
3985                         p = xdr_reserve_space(xdr, 8);
3986                         if (!p)
3987                                 return nfserr_resource;
3988                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3989                         /* deleg signaling not supported yet: */
3990                         *p++ = cpu_to_be32(0);
3991                         break;
3992                 default:
3993                         p = xdr_reserve_space(xdr, 4);
3994                         if (!p)
3995                                 return nfserr_resource;
3996                         *p++ = cpu_to_be32(open->op_why_no_deleg);
3997                 }
3998                 break;
3999         default:
4000                 BUG();
4001         }
4002         /* XXX save filehandle here */
4003         return 0;
4004 }
4005
4006 static __be32
4007 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4008                           union nfsd4_op_u *u)
4009 {
4010         struct nfsd4_open_confirm *oc = &u->open_confirm;
4011         struct xdr_stream *xdr = resp->xdr;
4012
4013         return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
4014 }
4015
4016 static __be32
4017 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4018                             union nfsd4_op_u *u)
4019 {
4020         struct nfsd4_open_downgrade *od = &u->open_downgrade;
4021         struct xdr_stream *xdr = resp->xdr;
4022
4023         return nfsd4_encode_stateid(xdr, &od->od_stateid);
4024 }
4025
4026 static __be32 nfsd4_encode_splice_read(
4027                                 struct nfsd4_compoundres *resp,
4028                                 struct nfsd4_read *read,
4029                                 struct file *file, unsigned long maxcount)
4030 {
4031         struct xdr_stream *xdr = resp->xdr;
4032         struct xdr_buf *buf = xdr->buf;
4033         int status, space_left;
4034         __be32 nfserr;
4035
4036         /* Make sure there will be room for padding if needed */
4037         if (xdr->end - xdr->p < 1)
4038                 return nfserr_resource;
4039
4040         nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
4041                                   file, read->rd_offset, &maxcount,
4042                                   &read->rd_eof);
4043         read->rd_length = maxcount;
4044         if (nfserr)
4045                 goto out_err;
4046         status = svc_encode_result_payload(read->rd_rqstp,
4047                                            buf->head[0].iov_len, maxcount);
4048         if (status) {
4049                 nfserr = nfserrno(status);
4050                 goto out_err;
4051         }
4052
4053         buf->page_len = maxcount;
4054         buf->len += maxcount;
4055         xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
4056                                                         / PAGE_SIZE;
4057
4058         /* Use rest of head for padding and remaining ops: */
4059         buf->tail[0].iov_base = xdr->p;
4060         buf->tail[0].iov_len = 0;
4061         xdr->iov = buf->tail;
4062         if (maxcount&3) {
4063                 int pad = 4 - (maxcount&3);
4064
4065                 *(xdr->p++) = 0;
4066
4067                 buf->tail[0].iov_base += maxcount&3;
4068                 buf->tail[0].iov_len = pad;
4069                 buf->len += pad;
4070         }
4071
4072         space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4073                                 buf->buflen - buf->len);
4074         buf->buflen = buf->len + space_left;
4075         xdr->end = (__be32 *)((void *)xdr->end + space_left);
4076
4077         return 0;
4078
4079 out_err:
4080         /*
4081          * nfsd_splice_actor may have already messed with the
4082          * page length; reset it so as not to confuse
4083          * xdr_truncate_encode in our caller.
4084          */
4085         buf->page_len = 0;
4086         return nfserr;
4087 }
4088
4089 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4090                                  struct nfsd4_read *read,
4091                                  struct file *file, unsigned long maxcount)
4092 {
4093         struct xdr_stream *xdr = resp->xdr;
4094         unsigned int starting_len = xdr->buf->len;
4095         __be32 zero = xdr_zero;
4096         __be32 nfserr;
4097
4098         read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount);
4099         if (read->rd_vlen < 0)
4100                 return nfserr_resource;
4101
4102         nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
4103                             resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
4104                             &read->rd_eof);
4105         read->rd_length = maxcount;
4106         if (nfserr)
4107                 return nfserr;
4108         if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
4109                 return nfserr_io;
4110         xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
4111
4112         write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4113                                xdr_pad_size(maxcount));
4114         return nfs_ok;
4115 }
4116
4117 static __be32
4118 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4119                   union nfsd4_op_u *u)
4120 {
4121         struct nfsd4_read *read = &u->read;
4122         bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4123         unsigned long maxcount;
4124         struct xdr_stream *xdr = resp->xdr;
4125         struct file *file;
4126         int starting_len = xdr->buf->len;
4127         __be32 *p;
4128
4129         if (nfserr)
4130                 return nfserr;
4131         file = read->rd_nf->nf_file;
4132
4133         p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4134         if (!p) {
4135                 WARN_ON_ONCE(splice_ok);
4136                 return nfserr_resource;
4137         }
4138         if (resp->xdr->buf->page_len && splice_ok) {
4139                 WARN_ON_ONCE(1);
4140                 return nfserr_serverfault;
4141         }
4142         xdr_commit_encode(xdr);
4143
4144         maxcount = min_t(unsigned long, read->rd_length,
4145                          (xdr->buf->buflen - xdr->buf->len));
4146
4147         if (file->f_op->splice_read && splice_ok)
4148                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4149         else
4150                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4151         if (nfserr) {
4152                 xdr_truncate_encode(xdr, starting_len);
4153                 return nfserr;
4154         }
4155
4156         p = xdr_encode_bool(p, read->rd_eof);
4157         *p = cpu_to_be32(read->rd_length);
4158         return nfs_ok;
4159 }
4160
4161 static __be32
4162 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4163                       union nfsd4_op_u *u)
4164 {
4165         struct nfsd4_readlink *readlink = &u->readlink;
4166         __be32 *p, *maxcount_p, zero = xdr_zero;
4167         struct xdr_stream *xdr = resp->xdr;
4168         int length_offset = xdr->buf->len;
4169         int maxcount, status;
4170
4171         maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4172         if (!maxcount_p)
4173                 return nfserr_resource;
4174         maxcount = PAGE_SIZE;
4175
4176         p = xdr_reserve_space(xdr, maxcount);
4177         if (!p)
4178                 return nfserr_resource;
4179         /*
4180          * XXX: By default, vfs_readlink() will truncate symlinks if they
4181          * would overflow the buffer.  Is this kosher in NFSv4?  If not, one
4182          * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4183          * that truncation occurred, and return NFS4ERR_RESOURCE.
4184          */
4185         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4186                                                 (char *)p, &maxcount);
4187         if (nfserr == nfserr_isdir)
4188                 nfserr = nfserr_inval;
4189         if (nfserr)
4190                 goto out_err;
4191         status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4192                                            maxcount);
4193         if (status) {
4194                 nfserr = nfserrno(status);
4195                 goto out_err;
4196         }
4197         *maxcount_p = cpu_to_be32(maxcount);
4198         xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4199         write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4200                                xdr_pad_size(maxcount));
4201         return nfs_ok;
4202
4203 out_err:
4204         xdr_truncate_encode(xdr, length_offset);
4205         return nfserr;
4206 }
4207
4208 static __be32
4209 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4210                      union nfsd4_op_u *u)
4211 {
4212         struct nfsd4_readdir *readdir = &u->readdir;
4213         int maxcount;
4214         int bytes_left;
4215         loff_t offset;
4216         __be64 wire_offset;
4217         struct xdr_stream *xdr = resp->xdr;
4218         int starting_len = xdr->buf->len;
4219         __be32 *p;
4220
4221         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
4222         if (!p)
4223                 return nfserr_resource;
4224
4225         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
4226         *p++ = cpu_to_be32(0);
4227         *p++ = cpu_to_be32(0);
4228         xdr->buf->head[0].iov_len = (char *)xdr->p -
4229                                     (char *)xdr->buf->head[0].iov_base;
4230
4231         /*
4232          * Number of bytes left for directory entries allowing for the
4233          * final 8 bytes of the readdir and a following failed op:
4234          */
4235         bytes_left = xdr->buf->buflen - xdr->buf->len
4236                         - COMPOUND_ERR_SLACK_SPACE - 8;
4237         if (bytes_left < 0) {
4238                 nfserr = nfserr_resource;
4239                 goto err_no_verf;
4240         }
4241         maxcount = svc_max_payload(resp->rqstp);
4242         maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
4243         /*
4244          * Note the rfc defines rd_maxcount as the size of the
4245          * READDIR4resok structure, which includes the verifier above
4246          * and the 8 bytes encoded at the end of this function:
4247          */
4248         if (maxcount < 16) {
4249                 nfserr = nfserr_toosmall;
4250                 goto err_no_verf;
4251         }
4252         maxcount = min_t(int, maxcount-16, bytes_left);
4253
4254         /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
4255         if (!readdir->rd_dircount)
4256                 readdir->rd_dircount = svc_max_payload(resp->rqstp);
4257
4258         readdir->xdr = xdr;
4259         readdir->rd_maxcount = maxcount;
4260         readdir->common.err = 0;
4261         readdir->cookie_offset = 0;
4262
4263         offset = readdir->rd_cookie;
4264         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
4265                               &offset,
4266                               &readdir->common, nfsd4_encode_dirent);
4267         if (nfserr == nfs_ok &&
4268             readdir->common.err == nfserr_toosmall &&
4269             xdr->buf->len == starting_len + 8) {
4270                 /* nothing encoded; which limit did we hit?: */
4271                 if (maxcount - 16 < bytes_left)
4272                         /* It was the fault of rd_maxcount: */
4273                         nfserr = nfserr_toosmall;
4274                 else
4275                         /* We ran out of buffer space: */
4276                         nfserr = nfserr_resource;
4277         }
4278         if (nfserr)
4279                 goto err_no_verf;
4280
4281         if (readdir->cookie_offset) {
4282                 wire_offset = cpu_to_be64(offset);
4283                 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
4284                                                         &wire_offset, 8);
4285         }
4286
4287         p = xdr_reserve_space(xdr, 8);
4288         if (!p) {
4289                 WARN_ON_ONCE(1);
4290                 goto err_no_verf;
4291         }
4292         *p++ = 0;       /* no more entries */
4293         *p++ = htonl(readdir->common.err == nfserr_eof);
4294
4295         return 0;
4296 err_no_verf:
4297         xdr_truncate_encode(xdr, starting_len);
4298         return nfserr;
4299 }
4300
4301 static __be32
4302 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4303                     union nfsd4_op_u *u)
4304 {
4305         struct nfsd4_remove *remove = &u->remove;
4306         struct xdr_stream *xdr = resp->xdr;
4307         __be32 *p;
4308
4309         p = xdr_reserve_space(xdr, 20);
4310         if (!p)
4311                 return nfserr_resource;
4312         p = encode_cinfo(p, &remove->rm_cinfo);
4313         return 0;
4314 }
4315
4316 static __be32
4317 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4318                     union nfsd4_op_u *u)
4319 {
4320         struct nfsd4_rename *rename = &u->rename;
4321         struct xdr_stream *xdr = resp->xdr;
4322         __be32 *p;
4323
4324         p = xdr_reserve_space(xdr, 40);
4325         if (!p)
4326                 return nfserr_resource;
4327         p = encode_cinfo(p, &rename->rn_sinfo);
4328         p = encode_cinfo(p, &rename->rn_tinfo);
4329         return 0;
4330 }
4331
4332 static __be32
4333 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4334 {
4335         u32 i, nflavs, supported;
4336         struct exp_flavor_info *flavs;
4337         struct exp_flavor_info def_flavs[2];
4338         __be32 *p, *flavorsp;
4339         static bool report = true;
4340
4341         if (exp->ex_nflavors) {
4342                 flavs = exp->ex_flavors;
4343                 nflavs = exp->ex_nflavors;
4344         } else { /* Handling of some defaults in absence of real secinfo: */
4345                 flavs = def_flavs;
4346                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4347                         nflavs = 2;
4348                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4349                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
4350                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4351                         nflavs = 1;
4352                         flavs[0].pseudoflavor
4353                                         = svcauth_gss_flavor(exp->ex_client);
4354                 } else {
4355                         nflavs = 1;
4356                         flavs[0].pseudoflavor
4357                                         = exp->ex_client->flavour->flavour;
4358                 }
4359         }
4360
4361         supported = 0;
4362         p = xdr_reserve_space(xdr, 4);
4363         if (!p)
4364                 return nfserr_resource;
4365         flavorsp = p++;         /* to be backfilled later */
4366
4367         for (i = 0; i < nflavs; i++) {
4368                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4369                 struct rpcsec_gss_info info;
4370
4371                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4372                         supported++;
4373                         p = xdr_reserve_space(xdr, 4 + 4 +
4374                                               XDR_LEN(info.oid.len) + 4 + 4);
4375                         if (!p)
4376                                 return nfserr_resource;
4377                         *p++ = cpu_to_be32(RPC_AUTH_GSS);
4378                         p = xdr_encode_opaque(p,  info.oid.data, info.oid.len);
4379                         *p++ = cpu_to_be32(info.qop);
4380                         *p++ = cpu_to_be32(info.service);
4381                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4382                         supported++;
4383                         p = xdr_reserve_space(xdr, 4);
4384                         if (!p)
4385                                 return nfserr_resource;
4386                         *p++ = cpu_to_be32(pf);
4387                 } else {
4388                         if (report)
4389                                 pr_warn("NFS: SECINFO: security flavor %u "
4390                                         "is not supported\n", pf);
4391                 }
4392         }
4393
4394         if (nflavs != supported)
4395                 report = false;
4396         *flavorsp = htonl(supported);
4397         return 0;
4398 }
4399
4400 static __be32
4401 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4402                      union nfsd4_op_u *u)
4403 {
4404         struct nfsd4_secinfo *secinfo = &u->secinfo;
4405         struct xdr_stream *xdr = resp->xdr;
4406
4407         return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4408 }
4409
4410 static __be32
4411 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4412                      union nfsd4_op_u *u)
4413 {
4414         struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4415         struct xdr_stream *xdr = resp->xdr;
4416
4417         return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4418 }
4419
4420 /*
4421  * The SETATTR encode routine is special -- it always encodes a bitmap,
4422  * regardless of the error status.
4423  */
4424 static __be32
4425 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4426                      union nfsd4_op_u *u)
4427 {
4428         struct nfsd4_setattr *setattr = &u->setattr;
4429         struct xdr_stream *xdr = resp->xdr;
4430         __be32 *p;
4431
4432         p = xdr_reserve_space(xdr, 16);
4433         if (!p)
4434                 return nfserr_resource;
4435         if (nfserr) {
4436                 *p++ = cpu_to_be32(3);
4437                 *p++ = cpu_to_be32(0);
4438                 *p++ = cpu_to_be32(0);
4439                 *p++ = cpu_to_be32(0);
4440         }
4441         else {
4442                 *p++ = cpu_to_be32(3);
4443                 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
4444                 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
4445                 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
4446         }
4447         return nfserr;
4448 }
4449
4450 static __be32
4451 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4452                          union nfsd4_op_u *u)
4453 {
4454         struct nfsd4_setclientid *scd = &u->setclientid;
4455         struct xdr_stream *xdr = resp->xdr;
4456         __be32 *p;
4457
4458         if (!nfserr) {
4459                 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
4460                 if (!p)
4461                         return nfserr_resource;
4462                 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
4463                 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
4464                                                 NFS4_VERIFIER_SIZE);
4465         }
4466         else if (nfserr == nfserr_clid_inuse) {
4467                 p = xdr_reserve_space(xdr, 8);
4468                 if (!p)
4469                         return nfserr_resource;
4470                 *p++ = cpu_to_be32(0);
4471                 *p++ = cpu_to_be32(0);
4472         }
4473         return nfserr;
4474 }
4475
4476 static __be32
4477 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4478                    union nfsd4_op_u *u)
4479 {
4480         struct nfsd4_write *write = &u->write;
4481         struct xdr_stream *xdr = resp->xdr;
4482         __be32 *p;
4483
4484         p = xdr_reserve_space(xdr, 16);
4485         if (!p)
4486                 return nfserr_resource;
4487         *p++ = cpu_to_be32(write->wr_bytes_written);
4488         *p++ = cpu_to_be32(write->wr_how_written);
4489         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4490                                                 NFS4_VERIFIER_SIZE);
4491         return 0;
4492 }
4493
4494 static __be32
4495 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4496                          union nfsd4_op_u *u)
4497 {
4498         struct nfsd4_exchange_id *exid = &u->exchange_id;
4499         struct xdr_stream *xdr = resp->xdr;
4500         __be32 *p;
4501         char *major_id;
4502         char *server_scope;
4503         int major_id_sz;
4504         int server_scope_sz;
4505         uint64_t minor_id = 0;
4506         struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4507
4508         major_id = nn->nfsd_name;
4509         major_id_sz = strlen(nn->nfsd_name);
4510         server_scope = nn->nfsd_name;
4511         server_scope_sz = strlen(nn->nfsd_name);
4512
4513         p = xdr_reserve_space(xdr,
4514                 8 /* eir_clientid */ +
4515                 4 /* eir_sequenceid */ +
4516                 4 /* eir_flags */ +
4517                 4 /* spr_how */);
4518         if (!p)
4519                 return nfserr_resource;
4520
4521         p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
4522         *p++ = cpu_to_be32(exid->seqid);
4523         *p++ = cpu_to_be32(exid->flags);
4524
4525         *p++ = cpu_to_be32(exid->spa_how);
4526
4527         switch (exid->spa_how) {
4528         case SP4_NONE:
4529                 break;
4530         case SP4_MACH_CRED:
4531                 /* spo_must_enforce bitmap: */
4532                 nfserr = nfsd4_encode_bitmap(xdr,
4533                                         exid->spo_must_enforce[0],
4534                                         exid->spo_must_enforce[1],
4535                                         exid->spo_must_enforce[2]);
4536                 if (nfserr)
4537                         return nfserr;
4538                 /* spo_must_allow bitmap: */
4539                 nfserr = nfsd4_encode_bitmap(xdr,
4540                                         exid->spo_must_allow[0],
4541                                         exid->spo_must_allow[1],
4542                                         exid->spo_must_allow[2]);
4543                 if (nfserr)
4544                         return nfserr;
4545                 break;
4546         default:
4547                 WARN_ON_ONCE(1);
4548         }
4549
4550         p = xdr_reserve_space(xdr,
4551                 8 /* so_minor_id */ +
4552                 4 /* so_major_id.len */ +
4553                 (XDR_QUADLEN(major_id_sz) * 4) +
4554                 4 /* eir_server_scope.len */ +
4555                 (XDR_QUADLEN(server_scope_sz) * 4) +
4556                 4 /* eir_server_impl_id.count (0) */);
4557         if (!p)
4558                 return nfserr_resource;
4559
4560         /* The server_owner struct */
4561         p = xdr_encode_hyper(p, minor_id);      /* Minor id */
4562         /* major id */
4563         p = xdr_encode_opaque(p, major_id, major_id_sz);
4564
4565         /* Server scope */
4566         p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4567
4568         /* Implementation id */
4569         *p++ = cpu_to_be32(0);  /* zero length nfs_impl_id4 array */
4570         return 0;
4571 }
4572
4573 static __be32
4574 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4575                             union nfsd4_op_u *u)
4576 {
4577         struct nfsd4_create_session *sess = &u->create_session;
4578         struct xdr_stream *xdr = resp->xdr;
4579         __be32 *p;
4580
4581         p = xdr_reserve_space(xdr, 24);
4582         if (!p)
4583                 return nfserr_resource;
4584         p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4585                                         NFS4_MAX_SESSIONID_LEN);
4586         *p++ = cpu_to_be32(sess->seqid);
4587         *p++ = cpu_to_be32(sess->flags);
4588
4589         p = xdr_reserve_space(xdr, 28);
4590         if (!p)
4591                 return nfserr_resource;
4592         *p++ = cpu_to_be32(0); /* headerpadsz */
4593         *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4594         *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4595         *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4596         *p++ = cpu_to_be32(sess->fore_channel.maxops);
4597         *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4598         *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4599
4600         if (sess->fore_channel.nr_rdma_attrs) {
4601                 p = xdr_reserve_space(xdr, 4);
4602                 if (!p)
4603                         return nfserr_resource;
4604                 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4605         }
4606
4607         p = xdr_reserve_space(xdr, 28);
4608         if (!p)
4609                 return nfserr_resource;
4610         *p++ = cpu_to_be32(0); /* headerpadsz */
4611         *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4612         *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4613         *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4614         *p++ = cpu_to_be32(sess->back_channel.maxops);
4615         *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4616         *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4617
4618         if (sess->back_channel.nr_rdma_attrs) {
4619                 p = xdr_reserve_space(xdr, 4);
4620                 if (!p)
4621                         return nfserr_resource;
4622                 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4623         }
4624         return 0;
4625 }
4626
4627 static __be32
4628 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4629                       union nfsd4_op_u *u)
4630 {
4631         struct nfsd4_sequence *seq = &u->sequence;
4632         struct xdr_stream *xdr = resp->xdr;
4633         __be32 *p;
4634
4635         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4636         if (!p)
4637                 return nfserr_resource;
4638         p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4639                                         NFS4_MAX_SESSIONID_LEN);
4640         *p++ = cpu_to_be32(seq->seqid);
4641         *p++ = cpu_to_be32(seq->slotid);
4642         /* Note slotid's are numbered from zero: */
4643         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4644         *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4645         *p++ = cpu_to_be32(seq->status_flags);
4646
4647         resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4648         return 0;
4649 }
4650
4651 static __be32
4652 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4653                           union nfsd4_op_u *u)
4654 {
4655         struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
4656         struct xdr_stream *xdr = resp->xdr;
4657         struct nfsd4_test_stateid_id *stateid, *next;
4658         __be32 *p;
4659
4660         p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4661         if (!p)
4662                 return nfserr_resource;
4663         *p++ = htonl(test_stateid->ts_num_ids);
4664
4665         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4666                 *p++ = stateid->ts_id_status;
4667         }
4668
4669         return 0;
4670 }
4671
4672 #ifdef CONFIG_NFSD_PNFS
4673 static __be32
4674 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4675                 union nfsd4_op_u *u)
4676 {
4677         struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
4678         struct xdr_stream *xdr = resp->xdr;
4679         const struct nfsd4_layout_ops *ops;
4680         u32 starting_len = xdr->buf->len, needed_len;
4681         __be32 *p;
4682
4683         p = xdr_reserve_space(xdr, 4);
4684         if (!p)
4685                 return nfserr_resource;
4686
4687         *p++ = cpu_to_be32(gdev->gd_layout_type);
4688
4689         ops = nfsd4_layout_ops[gdev->gd_layout_type];
4690         nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4691         if (nfserr) {
4692                 /*
4693                  * We don't bother to burden the layout drivers with
4694                  * enforcing gd_maxcount, just tell the client to
4695                  * come back with a bigger buffer if it's not enough.
4696                  */
4697                 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4698                         goto toosmall;
4699                 return nfserr;
4700         }
4701
4702         if (gdev->gd_notify_types) {
4703                 p = xdr_reserve_space(xdr, 4 + 4);
4704                 if (!p)
4705                         return nfserr_resource;
4706                 *p++ = cpu_to_be32(1);                  /* bitmap length */
4707                 *p++ = cpu_to_be32(gdev->gd_notify_types);
4708         } else {
4709                 p = xdr_reserve_space(xdr, 4);
4710                 if (!p)
4711                         return nfserr_resource;
4712                 *p++ = 0;
4713         }
4714
4715         return 0;
4716 toosmall:
4717         dprintk("%s: maxcount too small\n", __func__);
4718         needed_len = xdr->buf->len + 4 /* notifications */;
4719         xdr_truncate_encode(xdr, starting_len);
4720         p = xdr_reserve_space(xdr, 4);
4721         if (!p)
4722                 return nfserr_resource;
4723         *p++ = cpu_to_be32(needed_len);
4724         return nfserr_toosmall;
4725 }
4726
4727 static __be32
4728 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4729                 union nfsd4_op_u *u)
4730 {
4731         struct nfsd4_layoutget *lgp = &u->layoutget;
4732         struct xdr_stream *xdr = resp->xdr;
4733         const struct nfsd4_layout_ops *ops;
4734         __be32 *p;
4735
4736         p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4737         if (!p)
4738                 return nfserr_resource;
4739
4740         *p++ = cpu_to_be32(1);  /* we always set return-on-close */
4741         *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4742         p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4743                                     sizeof(stateid_opaque_t));
4744
4745         *p++ = cpu_to_be32(1);  /* we always return a single layout */
4746         p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4747         p = xdr_encode_hyper(p, lgp->lg_seg.length);
4748         *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4749         *p++ = cpu_to_be32(lgp->lg_layout_type);
4750
4751         ops = nfsd4_layout_ops[lgp->lg_layout_type];
4752         return ops->encode_layoutget(xdr, lgp);
4753 }
4754
4755 static __be32
4756 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4757                           union nfsd4_op_u *u)
4758 {
4759         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
4760         struct xdr_stream *xdr = resp->xdr;
4761         __be32 *p;
4762
4763         p = xdr_reserve_space(xdr, 4);
4764         if (!p)
4765                 return nfserr_resource;
4766         *p++ = cpu_to_be32(lcp->lc_size_chg);
4767         if (lcp->lc_size_chg) {
4768                 p = xdr_reserve_space(xdr, 8);
4769                 if (!p)
4770                         return nfserr_resource;
4771                 p = xdr_encode_hyper(p, lcp->lc_newsize);
4772         }
4773
4774         return 0;
4775 }
4776
4777 static __be32
4778 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4779                 union nfsd4_op_u *u)
4780 {
4781         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
4782         struct xdr_stream *xdr = resp->xdr;
4783         __be32 *p;
4784
4785         p = xdr_reserve_space(xdr, 4);
4786         if (!p)
4787                 return nfserr_resource;
4788         *p++ = cpu_to_be32(lrp->lrs_present);
4789         if (lrp->lrs_present)
4790                 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4791         return 0;
4792 }
4793 #endif /* CONFIG_NFSD_PNFS */
4794
4795 static __be32
4796 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4797                 struct nfsd42_write_res *write, bool sync)
4798 {
4799         __be32 *p;
4800         p = xdr_reserve_space(resp->xdr, 4);
4801         if (!p)
4802                 return nfserr_resource;
4803
4804         if (sync)
4805                 *p++ = cpu_to_be32(0);
4806         else {
4807                 __be32 nfserr;
4808                 *p++ = cpu_to_be32(1);
4809                 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid);
4810                 if (nfserr)
4811                         return nfserr;
4812         }
4813         p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4814         if (!p)
4815                 return nfserr_resource;
4816
4817         p = xdr_encode_hyper(p, write->wr_bytes_written);
4818         *p++ = cpu_to_be32(write->wr_stable_how);
4819         p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4820                                     NFS4_VERIFIER_SIZE);
4821         return nfs_ok;
4822 }
4823
4824 static __be32
4825 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4826 {
4827         struct xdr_stream *xdr = resp->xdr;
4828         struct nfs42_netaddr *addr;
4829         __be32 *p;
4830
4831         p = xdr_reserve_space(xdr, 4);
4832         *p++ = cpu_to_be32(ns->nl4_type);
4833
4834         switch (ns->nl4_type) {
4835         case NL4_NETADDR:
4836                 addr = &ns->u.nl4_addr;
4837
4838                 /* netid_len, netid, uaddr_len, uaddr (port included
4839                  * in RPCBIND_MAXUADDRLEN)
4840                  */
4841                 p = xdr_reserve_space(xdr,
4842                         4 /* netid len */ +
4843                         (XDR_QUADLEN(addr->netid_len) * 4) +
4844                         4 /* uaddr len */ +
4845                         (XDR_QUADLEN(addr->addr_len) * 4));
4846                 if (!p)
4847                         return nfserr_resource;
4848
4849                 *p++ = cpu_to_be32(addr->netid_len);
4850                 p = xdr_encode_opaque_fixed(p, addr->netid,
4851                                             addr->netid_len);
4852                 *p++ = cpu_to_be32(addr->addr_len);
4853                 p = xdr_encode_opaque_fixed(p, addr->addr,
4854                                         addr->addr_len);
4855                 break;
4856         default:
4857                 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4858                 return nfserr_inval;
4859         }
4860
4861         return 0;
4862 }
4863
4864 static __be32
4865 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4866                   union nfsd4_op_u *u)
4867 {
4868         struct nfsd4_copy *copy = &u->copy;
4869         __be32 *p;
4870
4871         nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4872                                          nfsd4_copy_is_sync(copy));
4873         if (nfserr)
4874                 return nfserr;
4875
4876         p = xdr_reserve_space(resp->xdr, 4 + 4);
4877         *p++ = xdr_one; /* cr_consecutive */
4878         *p = nfsd4_copy_is_sync(copy) ? xdr_one : xdr_zero;
4879         return 0;
4880 }
4881
4882 static __be32
4883 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4884                             union nfsd4_op_u *u)
4885 {
4886         struct nfsd4_offload_status *os = &u->offload_status;
4887         struct xdr_stream *xdr = resp->xdr;
4888         __be32 *p;
4889
4890         p = xdr_reserve_space(xdr, 8 + 4);
4891         if (!p)
4892                 return nfserr_resource;
4893         p = xdr_encode_hyper(p, os->count);
4894         *p++ = cpu_to_be32(0);
4895         return nfserr;
4896 }
4897
4898 static __be32
4899 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
4900                             struct nfsd4_read *read)
4901 {
4902         bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4903         struct file *file = read->rd_nf->nf_file;
4904         struct xdr_stream *xdr = resp->xdr;
4905         unsigned long maxcount;
4906         __be32 nfserr, *p;
4907
4908         /* Content type, offset, byte count */
4909         p = xdr_reserve_space(xdr, 4 + 8 + 4);
4910         if (!p)
4911                 return nfserr_io;
4912         if (resp->xdr->buf->page_len && splice_ok) {
4913                 WARN_ON_ONCE(splice_ok);
4914                 return nfserr_serverfault;
4915         }
4916
4917         maxcount = min_t(unsigned long, read->rd_length,
4918                          (xdr->buf->buflen - xdr->buf->len));
4919
4920         if (file->f_op->splice_read && splice_ok)
4921                 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4922         else
4923                 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4924         if (nfserr)
4925                 return nfserr;
4926
4927         *p++ = cpu_to_be32(NFS4_CONTENT_DATA);
4928         p = xdr_encode_hyper(p, read->rd_offset);
4929         *p = cpu_to_be32(read->rd_length);
4930
4931         return nfs_ok;
4932 }
4933
4934 static __be32
4935 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
4936                        union nfsd4_op_u *u)
4937 {
4938         struct nfsd4_read *read = &u->read;
4939         struct file *file = read->rd_nf->nf_file;
4940         struct xdr_stream *xdr = resp->xdr;
4941         int starting_len = xdr->buf->len;
4942         u32 segments = 0;
4943         __be32 *p;
4944
4945         if (nfserr)
4946                 return nfserr;
4947
4948         /* eof flag, segment count */
4949         p = xdr_reserve_space(xdr, 4 + 4);
4950         if (!p)
4951                 return nfserr_io;
4952         xdr_commit_encode(xdr);
4953
4954         read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
4955         if (read->rd_eof)
4956                 goto out;
4957
4958         nfserr = nfsd4_encode_read_plus_data(resp, read);
4959         if (nfserr) {
4960                 xdr_truncate_encode(xdr, starting_len);
4961                 return nfserr;
4962         }
4963
4964         segments++;
4965
4966 out:
4967         p = xdr_encode_bool(p, read->rd_eof);
4968         *p = cpu_to_be32(segments);
4969         return nfserr;
4970 }
4971
4972 static __be32
4973 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4974                          union nfsd4_op_u *u)
4975 {
4976         struct nfsd4_copy_notify *cn = &u->copy_notify;
4977         struct xdr_stream *xdr = resp->xdr;
4978         __be32 *p;
4979
4980         if (nfserr)
4981                 return nfserr;
4982
4983         /* 8 sec, 4 nsec */
4984         p = xdr_reserve_space(xdr, 12);
4985         if (!p)
4986                 return nfserr_resource;
4987
4988         /* cnr_lease_time */
4989         p = xdr_encode_hyper(p, cn->cpn_sec);
4990         *p++ = cpu_to_be32(cn->cpn_nsec);
4991
4992         /* cnr_stateid */
4993         nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4994         if (nfserr)
4995                 return nfserr;
4996
4997         /* cnr_src.nl_nsvr */
4998         p = xdr_reserve_space(xdr, 4);
4999         if (!p)
5000                 return nfserr_resource;
5001
5002         *p++ = cpu_to_be32(1);
5003
5004         nfserr = nfsd42_encode_nl4_server(resp, cn->cpn_src);
5005         return nfserr;
5006 }
5007
5008 static __be32
5009 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
5010                   union nfsd4_op_u *u)
5011 {
5012         struct nfsd4_seek *seek = &u->seek;
5013         __be32 *p;
5014
5015         p = xdr_reserve_space(resp->xdr, 4 + 8);
5016         *p++ = cpu_to_be32(seek->seek_eof);
5017         p = xdr_encode_hyper(p, seek->seek_pos);
5018
5019         return 0;
5020 }
5021
5022 static __be32
5023 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5024                   union nfsd4_op_u *p)
5025 {
5026         return nfserr;
5027 }
5028
5029 /*
5030  * Encode kmalloc-ed buffer in to XDR stream.
5031  */
5032 static __be32
5033 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5034 {
5035         u32 cplen;
5036         __be32 *p;
5037
5038         cplen = min_t(unsigned long, buflen,
5039                       ((void *)xdr->end - (void *)xdr->p));
5040         p = xdr_reserve_space(xdr, cplen);
5041         if (!p)
5042                 return nfserr_resource;
5043
5044         memcpy(p, buf, cplen);
5045         buf += cplen;
5046         buflen -= cplen;
5047
5048         while (buflen) {
5049                 cplen = min_t(u32, buflen, PAGE_SIZE);
5050                 p = xdr_reserve_space(xdr, cplen);
5051                 if (!p)
5052                         return nfserr_resource;
5053
5054                 memcpy(p, buf, cplen);
5055
5056                 if (cplen < PAGE_SIZE) {
5057                         /*
5058                          * We're done, with a length that wasn't page
5059                          * aligned, so possibly not word aligned. Pad
5060                          * any trailing bytes with 0.
5061                          */
5062                         xdr_encode_opaque_fixed(p, NULL, cplen);
5063                         break;
5064                 }
5065
5066                 buflen -= PAGE_SIZE;
5067                 buf += PAGE_SIZE;
5068         }
5069
5070         return 0;
5071 }
5072
5073 static __be32
5074 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5075                       union nfsd4_op_u *u)
5076 {
5077         struct nfsd4_getxattr *getxattr = &u->getxattr;
5078         struct xdr_stream *xdr = resp->xdr;
5079         __be32 *p, err;
5080
5081         p = xdr_reserve_space(xdr, 4);
5082         if (!p)
5083                 return nfserr_resource;
5084
5085         *p = cpu_to_be32(getxattr->getxa_len);
5086
5087         if (getxattr->getxa_len == 0)
5088                 return 0;
5089
5090         err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5091                                     getxattr->getxa_len);
5092
5093         kvfree(getxattr->getxa_buf);
5094
5095         return err;
5096 }
5097
5098 static __be32
5099 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5100                       union nfsd4_op_u *u)
5101 {
5102         struct nfsd4_setxattr *setxattr = &u->setxattr;
5103         struct xdr_stream *xdr = resp->xdr;
5104         __be32 *p;
5105
5106         p = xdr_reserve_space(xdr, 20);
5107         if (!p)
5108                 return nfserr_resource;
5109
5110         encode_cinfo(p, &setxattr->setxa_cinfo);
5111
5112         return 0;
5113 }
5114
5115 /*
5116  * See if there are cookie values that can be rejected outright.
5117  */
5118 static __be32
5119 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5120                                 u32 *offsetp)
5121 {
5122         u64 cookie = listxattrs->lsxa_cookie;
5123
5124         /*
5125          * If the cookie is larger than the maximum number we can fit
5126          * in either the buffer we just got back from vfs_listxattr, or,
5127          * XDR-encoded, in the return buffer, it's invalid.
5128          */
5129         if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5130                 return nfserr_badcookie;
5131
5132         if (cookie > (listxattrs->lsxa_maxcount /
5133                       (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
5134                 return nfserr_badcookie;
5135
5136         *offsetp = (u32)cookie;
5137         return 0;
5138 }
5139
5140 static __be32
5141 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5142                         union nfsd4_op_u *u)
5143 {
5144         struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
5145         struct xdr_stream *xdr = resp->xdr;
5146         u32 cookie_offset, count_offset, eof;
5147         u32 left, xdrleft, slen, count;
5148         u32 xdrlen, offset;
5149         u64 cookie;
5150         char *sp;
5151         __be32 status, tmp;
5152         __be32 *p;
5153         u32 nuser;
5154
5155         eof = 1;
5156
5157         status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5158         if (status)
5159                 goto out;
5160
5161         /*
5162          * Reserve space for the cookie and the name array count. Record
5163          * the offsets to save them later.
5164          */
5165         cookie_offset = xdr->buf->len;
5166         count_offset = cookie_offset + 8;
5167         p = xdr_reserve_space(xdr, 12);
5168         if (!p) {
5169                 status = nfserr_resource;
5170                 goto out;
5171         }
5172
5173         count = 0;
5174         left = listxattrs->lsxa_len;
5175         sp = listxattrs->lsxa_buf;
5176         nuser = 0;
5177
5178         xdrleft = listxattrs->lsxa_maxcount;
5179
5180         while (left > 0 && xdrleft > 0) {
5181                 slen = strlen(sp);
5182
5183                 /*
5184                  * Check if this is a "user." attribute, skip it if not.
5185                  */
5186                 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5187                         goto contloop;
5188
5189                 slen -= XATTR_USER_PREFIX_LEN;
5190                 xdrlen = 4 + ((slen + 3) & ~3);
5191                 if (xdrlen > xdrleft) {
5192                         if (count == 0) {
5193                                 /*
5194                                  * Can't even fit the first attribute name.
5195                                  */
5196                                 status = nfserr_toosmall;
5197                                 goto out;
5198                         }
5199                         eof = 0;
5200                         goto wreof;
5201                 }
5202
5203                 left -= XATTR_USER_PREFIX_LEN;
5204                 sp += XATTR_USER_PREFIX_LEN;
5205                 if (nuser++ < offset)
5206                         goto contloop;
5207
5208
5209                 p = xdr_reserve_space(xdr, xdrlen);
5210                 if (!p) {
5211                         status = nfserr_resource;
5212                         goto out;
5213                 }
5214
5215                 xdr_encode_opaque(p, sp, slen);
5216
5217                 xdrleft -= xdrlen;
5218                 count++;
5219 contloop:
5220                 sp += slen + 1;
5221                 left -= slen + 1;
5222         }
5223
5224         /*
5225          * If there were user attributes to copy, but we didn't copy
5226          * any, the offset was too large (e.g. the cookie was invalid).
5227          */
5228         if (nuser > 0 && count == 0) {
5229                 status = nfserr_badcookie;
5230                 goto out;
5231         }
5232
5233 wreof:
5234         p = xdr_reserve_space(xdr, 4);
5235         if (!p) {
5236                 status = nfserr_resource;
5237                 goto out;
5238         }
5239         *p = cpu_to_be32(eof);
5240
5241         cookie = offset + count;
5242
5243         write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
5244         tmp = cpu_to_be32(count);
5245         write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5246 out:
5247         if (listxattrs->lsxa_len)
5248                 kvfree(listxattrs->lsxa_buf);
5249         return status;
5250 }
5251
5252 static __be32
5253 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5254                          union nfsd4_op_u *u)
5255 {
5256         struct nfsd4_removexattr *removexattr = &u->removexattr;
5257         struct xdr_stream *xdr = resp->xdr;
5258         __be32 *p;
5259
5260         p = xdr_reserve_space(xdr, 20);
5261         if (!p)
5262                 return nfserr_resource;
5263
5264         p = encode_cinfo(p, &removexattr->rmxa_cinfo);
5265         return 0;
5266 }
5267
5268 typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5269
5270 /*
5271  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5272  * since we don't need to filter out obsolete ops as this is
5273  * done in the decoding phase.
5274  */
5275 static const nfsd4_enc nfsd4_enc_ops[] = {
5276         [OP_ACCESS]             = nfsd4_encode_access,
5277         [OP_CLOSE]              = nfsd4_encode_close,
5278         [OP_COMMIT]             = nfsd4_encode_commit,
5279         [OP_CREATE]             = nfsd4_encode_create,
5280         [OP_DELEGPURGE]         = nfsd4_encode_noop,
5281         [OP_DELEGRETURN]        = nfsd4_encode_noop,
5282         [OP_GETATTR]            = nfsd4_encode_getattr,
5283         [OP_GETFH]              = nfsd4_encode_getfh,
5284         [OP_LINK]               = nfsd4_encode_link,
5285         [OP_LOCK]               = nfsd4_encode_lock,
5286         [OP_LOCKT]              = nfsd4_encode_lockt,
5287         [OP_LOCKU]              = nfsd4_encode_locku,
5288         [OP_LOOKUP]             = nfsd4_encode_noop,
5289         [OP_LOOKUPP]            = nfsd4_encode_noop,
5290         [OP_NVERIFY]            = nfsd4_encode_noop,
5291         [OP_OPEN]               = nfsd4_encode_open,
5292         [OP_OPENATTR]           = nfsd4_encode_noop,
5293         [OP_OPEN_CONFIRM]       = nfsd4_encode_open_confirm,
5294         [OP_OPEN_DOWNGRADE]     = nfsd4_encode_open_downgrade,
5295         [OP_PUTFH]              = nfsd4_encode_noop,
5296         [OP_PUTPUBFH]           = nfsd4_encode_noop,
5297         [OP_PUTROOTFH]          = nfsd4_encode_noop,
5298         [OP_READ]               = nfsd4_encode_read,
5299         [OP_READDIR]            = nfsd4_encode_readdir,
5300         [OP_READLINK]           = nfsd4_encode_readlink,
5301         [OP_REMOVE]             = nfsd4_encode_remove,
5302         [OP_RENAME]             = nfsd4_encode_rename,
5303         [OP_RENEW]              = nfsd4_encode_noop,
5304         [OP_RESTOREFH]          = nfsd4_encode_noop,
5305         [OP_SAVEFH]             = nfsd4_encode_noop,
5306         [OP_SECINFO]            = nfsd4_encode_secinfo,
5307         [OP_SETATTR]            = nfsd4_encode_setattr,
5308         [OP_SETCLIENTID]        = nfsd4_encode_setclientid,
5309         [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5310         [OP_VERIFY]             = nfsd4_encode_noop,
5311         [OP_WRITE]              = nfsd4_encode_write,
5312         [OP_RELEASE_LOCKOWNER]  = nfsd4_encode_noop,
5313
5314         /* NFSv4.1 operations */
5315         [OP_BACKCHANNEL_CTL]    = nfsd4_encode_noop,
5316         [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5317         [OP_EXCHANGE_ID]        = nfsd4_encode_exchange_id,
5318         [OP_CREATE_SESSION]     = nfsd4_encode_create_session,
5319         [OP_DESTROY_SESSION]    = nfsd4_encode_noop,
5320         [OP_FREE_STATEID]       = nfsd4_encode_noop,
5321         [OP_GET_DIR_DELEGATION] = nfsd4_encode_noop,
5322 #ifdef CONFIG_NFSD_PNFS
5323         [OP_GETDEVICEINFO]      = nfsd4_encode_getdeviceinfo,
5324         [OP_GETDEVICELIST]      = nfsd4_encode_noop,
5325         [OP_LAYOUTCOMMIT]       = nfsd4_encode_layoutcommit,
5326         [OP_LAYOUTGET]          = nfsd4_encode_layoutget,
5327         [OP_LAYOUTRETURN]       = nfsd4_encode_layoutreturn,
5328 #else
5329         [OP_GETDEVICEINFO]      = nfsd4_encode_noop,
5330         [OP_GETDEVICELIST]      = nfsd4_encode_noop,
5331         [OP_LAYOUTCOMMIT]       = nfsd4_encode_noop,
5332         [OP_LAYOUTGET]          = nfsd4_encode_noop,
5333         [OP_LAYOUTRETURN]       = nfsd4_encode_noop,
5334 #endif
5335         [OP_SECINFO_NO_NAME]    = nfsd4_encode_secinfo_no_name,
5336         [OP_SEQUENCE]           = nfsd4_encode_sequence,
5337         [OP_SET_SSV]            = nfsd4_encode_noop,
5338         [OP_TEST_STATEID]       = nfsd4_encode_test_stateid,
5339         [OP_WANT_DELEGATION]    = nfsd4_encode_noop,
5340         [OP_DESTROY_CLIENTID]   = nfsd4_encode_noop,
5341         [OP_RECLAIM_COMPLETE]   = nfsd4_encode_noop,
5342
5343         /* NFSv4.2 operations */
5344         [OP_ALLOCATE]           = nfsd4_encode_noop,
5345         [OP_COPY]               = nfsd4_encode_copy,
5346         [OP_COPY_NOTIFY]        = nfsd4_encode_copy_notify,
5347         [OP_DEALLOCATE]         = nfsd4_encode_noop,
5348         [OP_IO_ADVISE]          = nfsd4_encode_noop,
5349         [OP_LAYOUTERROR]        = nfsd4_encode_noop,
5350         [OP_LAYOUTSTATS]        = nfsd4_encode_noop,
5351         [OP_OFFLOAD_CANCEL]     = nfsd4_encode_noop,
5352         [OP_OFFLOAD_STATUS]     = nfsd4_encode_offload_status,
5353         [OP_READ_PLUS]          = nfsd4_encode_read_plus,
5354         [OP_SEEK]               = nfsd4_encode_seek,
5355         [OP_WRITE_SAME]         = nfsd4_encode_noop,
5356         [OP_CLONE]              = nfsd4_encode_noop,
5357
5358         /* RFC 8276 extended atributes operations */
5359         [OP_GETXATTR]           = nfsd4_encode_getxattr,
5360         [OP_SETXATTR]           = nfsd4_encode_setxattr,
5361         [OP_LISTXATTRS]         = nfsd4_encode_listxattrs,
5362         [OP_REMOVEXATTR]        = nfsd4_encode_removexattr,
5363 };
5364
5365 /*
5366  * Calculate whether we still have space to encode repsize bytes.
5367  * There are two considerations:
5368  *     - For NFS versions >=4.1, the size of the reply must stay within
5369  *       session limits
5370  *     - For all NFS versions, we must stay within limited preallocated
5371  *       buffer space.
5372  *
5373  * This is called before the operation is processed, so can only provide
5374  * an upper estimate.  For some nonidempotent operations (such as
5375  * getattr), it's not necessarily a problem if that estimate is wrong,
5376  * as we can fail it after processing without significant side effects.
5377  */
5378 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5379 {
5380         struct xdr_buf *buf = &resp->rqstp->rq_res;
5381         struct nfsd4_slot *slot = resp->cstate.slot;
5382
5383         if (buf->len + respsize <= buf->buflen)
5384                 return nfs_ok;
5385         if (!nfsd4_has_session(&resp->cstate))
5386                 return nfserr_resource;
5387         if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5388                 WARN_ON_ONCE(1);
5389                 return nfserr_rep_too_big_to_cache;
5390         }
5391         return nfserr_rep_too_big;
5392 }
5393
5394 void
5395 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5396 {
5397         struct xdr_stream *xdr = resp->xdr;
5398         struct nfs4_stateowner *so = resp->cstate.replay_owner;
5399         struct svc_rqst *rqstp = resp->rqstp;
5400         const struct nfsd4_operation *opdesc = op->opdesc;
5401         int post_err_offset;
5402         nfsd4_enc encoder;
5403         __be32 *p;
5404
5405         p = xdr_reserve_space(xdr, 8);
5406         if (!p)
5407                 goto release;
5408         *p++ = cpu_to_be32(op->opnum);
5409         post_err_offset = xdr->buf->len;
5410
5411         if (op->opnum == OP_ILLEGAL)
5412                 goto status;
5413         if (op->status && opdesc &&
5414                         !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5415                 goto status;
5416         BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5417                !nfsd4_enc_ops[op->opnum]);
5418         encoder = nfsd4_enc_ops[op->opnum];
5419         op->status = encoder(resp, op->status, &op->u);
5420         if (op->status)
5421                 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
5422         xdr_commit_encode(xdr);
5423
5424         /* nfsd4_check_resp_size guarantees enough room for error status */
5425         if (!op->status) {
5426                 int space_needed = 0;
5427                 if (!nfsd4_last_compound_op(rqstp))
5428                         space_needed = COMPOUND_ERR_SLACK_SPACE;
5429                 op->status = nfsd4_check_resp_size(resp, space_needed);
5430         }
5431         if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5432                 struct nfsd4_slot *slot = resp->cstate.slot;
5433
5434                 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5435                         op->status = nfserr_rep_too_big_to_cache;
5436                 else
5437                         op->status = nfserr_rep_too_big;
5438         }
5439         if (op->status == nfserr_resource ||
5440             op->status == nfserr_rep_too_big ||
5441             op->status == nfserr_rep_too_big_to_cache) {
5442                 /*
5443                  * The operation may have already been encoded or
5444                  * partially encoded.  No op returns anything additional
5445                  * in the case of one of these three errors, so we can
5446                  * just truncate back to after the status.  But it's a
5447                  * bug if we had to do this on a non-idempotent op:
5448                  */
5449                 warn_on_nonidempotent_op(op);
5450                 xdr_truncate_encode(xdr, post_err_offset);
5451         }
5452         if (so) {
5453                 int len = xdr->buf->len - post_err_offset;
5454
5455                 so->so_replay.rp_status = op->status;
5456                 so->so_replay.rp_buflen = len;
5457                 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5458                                                 so->so_replay.rp_buf, len);
5459         }
5460 status:
5461         *p = op->status;
5462 release:
5463         if (opdesc && opdesc->op_release)
5464                 opdesc->op_release(&op->u);
5465 }
5466
5467 /*
5468  * Encode the reply stored in the stateowner reply cache
5469  *
5470  * XDR note: do not encode rp->rp_buflen: the buffer contains the
5471  * previously sent already encoded operation.
5472  */
5473 void
5474 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5475 {
5476         __be32 *p;
5477         struct nfs4_replay *rp = op->replay;
5478
5479         p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
5480         if (!p) {
5481                 WARN_ON_ONCE(1);
5482                 return;
5483         }
5484         *p++ = cpu_to_be32(op->opnum);
5485         *p++ = rp->rp_status;  /* already xdr'ed */
5486
5487         p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
5488 }
5489
5490 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5491 {
5492         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5493
5494         if (args->ops != args->iops) {
5495                 vfree(args->ops);
5496                 args->ops = args->iops;
5497         }
5498         while (args->to_free) {
5499                 struct svcxdr_tmpbuf *tb = args->to_free;
5500                 args->to_free = tb->next;
5501                 kfree(tb);
5502         }
5503 }
5504
5505 bool
5506 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5507 {
5508         struct nfsd4_compoundargs *args = rqstp->rq_argp;
5509
5510         /* svcxdr_tmp_alloc */
5511         args->to_free = NULL;
5512
5513         args->xdr = xdr;
5514         args->ops = args->iops;
5515         args->rqstp = rqstp;
5516
5517         return nfsd4_decode_compound(args);
5518 }
5519
5520 bool
5521 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5522 {
5523         struct nfsd4_compoundres *resp = rqstp->rq_resp;
5524         __be32 *p;
5525
5526         /*
5527          * Send buffer space for the following items is reserved
5528          * at the top of nfsd4_proc_compound().
5529          */
5530         p = resp->statusp;
5531
5532         *p++ = resp->cstate.status;
5533
5534         rqstp->rq_next_page = xdr->page_ptr + 1;
5535
5536         *p++ = htonl(resp->taglen);
5537         memcpy(p, resp->tag, resp->taglen);
5538         p += XDR_QUADLEN(resp->taglen);
5539         *p++ = htonl(resp->opcnt);
5540
5541         nfsd4_sequence_done(resp);
5542         return true;
5543 }